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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act File Number: 811-21187

Registrant Name: PIMCO Municipal Income Fund III

Address of Principal Executive Offices: 1345 Avenue of the Americas, New York, NY 10105

Name and Address of Agent for Service: Lawrence G. Altadonna 1345 Avenue of the Americas, New York, NY 10105

Registrant’s telephone number, including area code: 212-739-3371

Date of Fiscal Year End: September 30, 2008

Date of Reporting Period: December 31, 2007

Form N-Q is to be used by the registered management investment company, other than a small business investment company registered on Form N-5 (§§ 239.24 and 274.5 of this chapter), to file reports with the Commission, not later than 60 days after the close of the first and third fiscal quarters, pursuant to rule 30b1-5 under the Investment Company Act of 1940 (17 CFR 270.30b1-5). The Commission may use the information provided on Form N-Q in its regulatory, disclosure review, inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-Q, and the Commission will make this information public. A registrant is not required to the collection of information contained in Form N-Q unless the Form displays a currently valid Office of Management and Budget (‘‘OMB’’) control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to the Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. § 3507.





Item 1.    Schedule of Investments

PIMCO Municipal Income Fund III 
Schedule of Investments
December 31, 2007 (unaudited)


Principal
Amount
(000)   Credit Rating
(Moody’s/S&P) Value*

MUNICIPAL BONDS & NOTES–97.6%

     

Alabama–1.1%

              Birmingham, GO, Ser. B, (Pre-refunded @ $100, 12/1/12) (AMBAC)(b),         $ 1,000   5.00%, 12/1/27 Aaa/AAA $ 1,079,250     2,560   5.00%, 12/1/32 Aaa/AAA   2,762,880     5,000   Birmingham Baptist Medical Centers Special Care Facs. Financing Auth. Rev., 5.00%, 11/15/30, Ser. A Baa1/NR   4,561,450     1,500   Colbert Cnty., Northwest Health Care Auth., Health Care Facs.
Rev., 5.75%, 6/1/27 Baa3/NR   1,457,250               9,860,830        

Alaska–0.8%

          3,100   Northern Tobacco Securitization Corp. Rev., 5.00%, 6/1/46, Ser. A Baa3/NR   2,550,277         State Housing Finance Corp. Rev.,           3,900   5.00%, 12/1/33, Ser. A Aaa/AAA   3,902,964     1,000   5.25%, 6/1/32, Ser. C (MBIA) Aaa/AAA   1,001,410               7,454,651        

Arizona–3.1%

              Health Facs. Auth. Rev.,           2,250   Beatitudes Project, 5.20%, 10/1/37 NR/NR   1,851,705     2,200   John C. Lincoln Health Network,               7.00%, 12/1/25, (Pre-refunded @ $102, 12/1/10) (b) NR/BBB   2,473,724     1,500   Maricopa Cnty. Pollution Control Corp., Pollution Control Rev., 5.05%, 5/1/29 (AMBAC) Aaa/AAA   1,542,540         Salt River Project Agricultural Improvement & Power Dist. Rev., Ser. A (i),           5,000   5.00%, 1/1/35 Aa1/AA   5,200,300     16,000   5.00%, 1/1/37 Aa1/AA   16,629,920               27,698,189        

Arkansas–0.1%

          7,000   Arkansas Dev. Finance Auth. Rev., zero coupon, 7/1/46 (AMBAC) Aaa/NR   991,130        

California–6.7%

          1,000   Alameda Public Financing Auth. Rev., 7.00%, 6/1/09 NR/NR   999,260     2,000   Chula Vista Community Facs. Dist., Special Tax, 5.25%, 9/1/30 NR/NR   1,776,860         Golden State Tobacco Securitization Corp., Tobacco Settlement Rev., Ser. A,           27,585   6.25%, 6/1/33 Aaa/AAA   30,272,882     21,000   6.75%, 6/1/39, (Pre-refunded @ $100, 6/1/13) (b) Aaa/AAA   24,279,570     3,060   Statewide Community Dev. Auth. Rev., Baptist Univ.,
9.00%, 11/1/17, Ser. B (c) NR/NR   3,186,776               60,515,348        

Colorado–3.4%

          1,000   Aurora Single Tree Metropolitan Dist., GO, 5.50%, 11/15/31 NR/NR   939,320         Colorado School of Mines Aux. Facs. Rev. (AMBAC),           340   5.00%, 12/1/37 Aaa/AAA   347,850     2,160   5.00%, 12/1/37, (Pre-refunded @ $100, 12/1/12) (b) Aaa/AAA   2,331,180  




PIMCO Municipal Income Fund III 
Schedule of Investments
December 31, 2007 (unaudited) (continued)


Principal
Amount
(000)   Credit Rating
(Moody’s/S&P) Value*      

Colorado–(continued)

        $ 9,955   Colorado Springs Rev., 5.00%, 11/15/30, Ser. B (i) Aa2/AA $ 10,248,573     500   Confluence Metropolitan Dist. Rev, 5.45%, 12/1/34 NR/NR   431,945         El Paso Cnty., CP (AMBAC),           1,735   5.00%, 12/1/23, Ser. A, (Pre-refunded @ $100, 12/1/12) (b) Aaa/AAA   1,872,499     1,725   5.00%, 12/1/23, Ser. B Aaa/AAA   1,791,775     2,820   5.00%, 12/1/27, Ser. A, (Pre-refunded @ $100, 12/1/12) (b) Aaa/AAA   3,043,485     1,500   5.00%, 12/1/27, Ser. B Aaa/AAA   1,545,960     1,500   Garfield Cnty. School Dist. Re-2, GO, 5.00%, 12/1/25 (FSA) Aaa/NR   1,554,690     1,000   Health Facs. Auth. Rev., American Baptist Homes, 5.90%, 8/1/37, Ser. A NR/NR   915,450     1,500   Housing & Finance Auth. Rev., Evergreen Country Day School,
5.875%, 6/1/37 (c) NR/BB   1,436,280     4,000   Saddle Rock Metropolitan Dist., GO, 5.35%, 12/1/31 (Radian) NR/AA   4,012,360               30,471,367        

Florida–5.7%

          3,480   Brevard Cnty. Health Facs. Auth. Rev., 5.00%, 4/1/34 A2/A   3,323,156     8,000   Highlands Cnty. Health Facs. Auth. Rev., Adventist Health System, 5.25%, 11/15/23, Ser. B, (Pre-refunded @ $100, 11/15/12) (b) A1/A+   8,643,120     2,500   Hillsborough Cnty. Industrial Dev. Auth. Rev., Tampa General Hospital, 5.25%, 10/1/34, Ser. B A3/NR   2,433,250     1,485   Julington Creek Plantation Community Dev. Dist., Special Assessment Rev., 5.00%, 5/1/29 (MBIA) Aaa/AAA   1,527,516     1,000   Orange Cnty. Housing Finance Auth., Multifamily Rev., Palm Grove Gardens, 5.25%, 1/1/28, Ser. G Aaa/NR   1,012,280     15,000   Pinellas Cnty. Health Facs. Auth. Rev., Baycare Health, 5.50%, 11/15/33, (Pre-refunded @ $100, 5/15/13) (b) Aa3/NR   16,563,000     3,895   Sarasota Cnty. Health Facs. Auth. Rev., 5.75%, 7/1/45 NR/NR   3,471,536     7,500   South Miami Health Facs. Auth., Hospital Rev., Baptist Health, 5.25%, 11/15/33, (Pre-refunded @ $100, 2/1/13) (b) Aaa/AA−   8,137,950     5,615   Tampa Water & Sewer Rev., 5.00%, 10/1/26 Aa2/AA   5,791,311               50,903,119        

Georgia–0.6%

          1,750   Fulton Cnty. Rev., 5.125%, 7/1/42, Ser. A NR/NR   1,424,623     4,000   Griffin Combined Public Utility Rev., 5.00%, 1/1/32 (AMBAC) Aaa/AAA   4,143,080               5,567,703        

Idaho–0.8%

              State Building Auth., Building Rev., Ser. A (XLCA),           1,000   5.00%, 9/1/33 Aaa/AAA   1,021,810     5,750   5.00%, 9/1/43 Aaa/AAA   5,854,190               6,876,000        

Illinois–6.1%

              Chicago, GO, Ser. A (MBIA),           1,530   5.00%, 1/1/31, (Pre-refunded @ $101, 1/1/11) (b) Aaa/AAA   1,623,682     720   5.00%, 1/1/31 Aaa/AAA   733,810  




PIMCO Municipal Income Fund III 
Schedule of Investments
December 31, 2007 (unaudited) (continued)


Principal
Amount
(000)   Credit Rating
(Moody’s/S&P) Value*      

Illinois–(continued)

              Chicago, Lake Shore East, Special Assessment,         $ 1,600   6.625%, 12/1/22 NR/NR $ 1,646,656     3,456   6.75%, 12/1/32 NR/NR   3,551,489     500   Chicago Board of Education School Reform, GO, zero coupon, 12/1/28, Ser. A (FGIC) Aaa/AAA   176,600     3,000   Chicago Kingsbury Redev. Project, Tax Allocation, 6.57%, 2/15/13, Ser. A NR/NR   3,029,970     7,000   Chicago Motor Fuel Tax Rev., 5.00%, 1/1/33, Ser. A (AMBAC)
Dev. Finance Auth. Rev., Aaa/AAA   7,168,630     2,000   Christian Homes, Inc., 5.75%, 5/15/31, Ser. A NR/NR   1,827,200     1,500   Franciscan Communities, 5.50%, 5/15/37 NR/NR   1,364,340     12,795   People Gas Light & Coke 5.00%, 2/1/33 (AMBAC)(i) Aaa/AAA   13,018,017     1,500   Sedgebrook, 6.00%, 11/15/37, Ser. A NR/NR   1,394,130     1,050   Three Crowns Park Plaza, 5.875%, 2/15/38 NR/NR   955,962         Educational Facs. Auth. Rev., Univ. of Chicago,           4,780   5.00%, 7/1/33 Aa1/AA   4,916,182     220   5.00%, 7/1/33, (Pre-refunded @ $100, 7/1/13) (b) Aa1/AA   238,531     165   5.25%, 7/1/41 Aa1/AA   171,613     4,160   5.25%, 7/1/41, (Pre-refunded @ $101, 7/1/11) (b) Aa1/AA   4,479,741         Finance Auth. Rev.,           1,000   5.875%, 3/1/27, Ser. A NR/NR   968,110     625   6.00%, 3/1/37, Ser. A NR/NR   599,250     1,175   Health Facs. Auth. Rev., Elmhurst Memorial Healthcare, 5.50%, 1/1/22 A2/NR   1,222,211     4,283   Round Lake, Special Tax Rev., 6.70%, 3/1/33, (Pre-refunded @ $102, 3/1/13) (b) NR/NR   4,906,690     600   Southwestern Dev. Auth. Rev., Comprehensive Mental Health Center, 6.625%, 6/1/37 NR/NR   589,662               54,582,476        

Indiana–3.1%

          7,535   Bond Bank Rev., 5.00%, 2/1/33, Ser. A (FSA)(i) Aaa/AAA   7,700,996     3,000   Brownsburg 1999 School Building Corp. Rev., 5.25%, 3/15/25,
Ser. A, (Pre-refunded @ $100, 9/15/13) (FSA)(b) Aaa/AAA   3,299,790     1,375   Fort Wayne Pollution Control Rev., 6.20%, 10/15/25 Caa1/B−   1,328,910     5,000   Indianapolis Local Public Improvement Board, Tax Allocation,
5.00%, 2/1/29, Ser. G (MBIA) Aaa/AAA   5,114,400         Michigan City Area Wide School Building Corp., Rev. (FGIC),           2,500   zero coupon, 1/15/21 Aaa/AAA   1,380,450     1,000   zero coupon, 7/15/21 Aaa/AAA   539,730     1,000   zero coupon, 1/15/22 Aaa/AAA   523,250     1,000   Plainfield Parks Facs. Corp. Lease Rent Rev., 5.00%, 1/15/22 (AMBAC) Aaa/AAA   1,031,650         Portage Industrial Economic Dev. Rev.,           1,000   5.00%, 7/15/23 NR/BBB+   940,650     775   5.00%, 1/15/27 NR/BBB+   715,937  




PIMCO Municipal Income Fund III 
Schedule of Investments
December 31, 2007 (unaudited) (continued)


Principal
Amount
(000)   Credit Rating
(Moody’s/S&P) Value*      

Indiana–(continued)

        $ 3,500   State Dev. Finance Auth., Pollution Control Rev., 5.00%, 3/1/30 (AMBAC) Aaa/AAA $ 3,505,460     2,000   Vigo Cnty. Hospital Auth. Rev., 5.70%, 9/1/37 (c) NR/NR   1,809,940               27,891,163        

Iowa–1.7%

          1,000   Coralville, CP, 5.25%, 6/1/26, Ser. D A2/NR   1,028,000     3,715   Finance Auth. Rev., Wedum Walnut Ridge LLC, 5.625%, 12/1/45, Ser. A NR/NR   3,235,691         Tobacco Settlement Auth. of Iowa Rev., Ser. B,           11,010   5.60%, 6/1/34 Baa3/BBB   10,007,539     1,000   5.60%, 6/1/35, (Pre-refunded @ $101, 6/1/11) (b) NR/AAA   1,079,790               15,351,020        

Kentucky–0.2%

              Economic Dev. Finance Auth., Hospital Facs. Rev.,           1,000   Catholic Healthcare Partners, 5.25%, 10/1/30 A1/AA−   1,010,780     1,080   St. Luke’s Hospital, 6.00%, 10/1/19, Ser. B A3/A   1,087,679               2,098,459        

Louisiana–1.0%

              Public Facs. Auth. Rev., Ochsner Clinic Foundation, Ser. B,           5,000   5.50%, 5/15/32, (Pre-refunded @ $100, 5/15/26) (b) Aaa/NR   5,735,550     1,700   5.50%, 5/15/47 A3/NR   1,675,622     1,595   Tobacco Settlement Financing Corp. Rev., 5.875%, 5/15/39, Ser. 2001-B Baa3/BBB   1,538,489               8,949,661        

Maryland–0.2%

          500   Health & Higher Educational Facs. Auth. Rev., 5.30%, 1/1/37 NR/NR   432,585     1,500   State Health & Higher Educational Facs. Auth. Rev., Calvert Health Systems, 5.50%, 7/1/36 A2/NR   1,543,650               1,976,235        

Massachusetts–1.1%

          1,000   State Dev. Finance Agcy. Rev.,
5.75%, 7/1/33, Ser. C, (Pre-refunded @ $101, 7/1/13) (b) A3/A−   1,128,880     750   Linden Ponds, 5.75%, 11/15/35, Ser. A NR/NR   677,063     4,910   State Housing Finance Agcy., Housing Rev., 5.125%, 6/1/43, Ser. H Aa3/AA−   4,925,614     3,225   State Water Pollution Abatement Trust Rev., 5.00%, 8/1/32, Ser. 8 Aaa/AAA   3,312,365               10,043,922        

Michigan–13.9%

          500   Corner Creek Academy East Rev., 5.25%, 11/1/36 A1/BB+   430,560     250   Crescent Academy, CP, 5.75%, 12/1/36 NR/NR   221,835         Detroit Water Supply System Rev.,           33,040   5.00%, 7/1/32, Ser. A (FSA)(i) Aaa/AAA   33,884,172     35,000   5.00%, 7/1/34, Ser. A (MBIA)(i) Aaa/AAA   35,706,650  




PIMCO Municipal Income Fund III 
Schedule of Investments
December 31, 2007 (unaudited) (continued)


Principal
Amount
(000)   Credit Rating
(Moody’s/S&P) Value*      

Michigan–(continued)

        $ 7,555   5.00%, 7/1/34, Ser. B (MBIA) Aaa/AAA $ 7,707,535     500   Star International Academy, CP, 6.125%, 3/1/37 NR/BB+   499,610     5,000   State Building Auth. Rev., 5.00%, 10/15/26, Ser. III, (Pre-refunded @ $100, 10/15/12) (FSA)(b) Aaa/AAA   5,386,600         State Hospital Finance Auth. Rev.,           175   Detroit Medical Center, 5.25%, 8/15/23 Ba3/BB−   157,537     4,000   Henry Ford Health System,
5.00%, 3/1/17, (Pre-refunded @ $100, 3/1/13) (b) A1/A   4,304,200         Oakwood Group, Ser. A,           5,405   5.75%, 4/1/32 A2/A   5,574,339     575   6.00%, 4/1/22 A2/A   611,518     20,000   Trinity Health Credit, 5.375%, 12/1/30 Aa2/AA   20,505,400     1,000   State Technical Univ. Rev., 5.00%, 10/1/33 (XLCA) Aaa/AAA   1,026,810     10,000   Tobacco Settlement Finance Auth. Rev., 6.00%, 6/1/48, Ser. A NR/BBB   9,689,700               125,706,466        

Minnesota–0.4%

          750   Cottage Grove Rev., 5.00%, 12/1/31 NR/NR   631,133     2,400   Upsala Independent School Dist. No. 487, GO, 5.00%, 2/1/28 (FGIC) Aaa/AAA   2,566,008               3,197,141        

Mississippi–0.5%

              Business Finance Corp., Pollution Control Rev.,           3,000   5.875%, 4/1/22 Ba1/BBB   3,002,520     1,250   5.90%, 5/1/22 Ba1/BBB   1,251,613               4,254,133        

Missouri–1.5%

          1,350   St. Louis Cnty. Industrial Dev. Auth.,
Housing Dev. Rev., 5.20%, 1/20/36 (GNMA) NR/AAA   1,360,395         St. Louis Industrial Dev. Auth. Rev. (GNMA),           1,500   5.125%, 12/20/29 NR/AAA   1,514,670     1,500   5.125%, 12/20/30 NR/AAA   1,508,115     7,500   State Health & Educational Facs. Auth., Health Facs. Rev.,
St. Anthony’s Medical Center, 6.25%, 12/1/30,
    (Pre-refunded @ $101, 12/1/10) (b) A2/NR   8,220,525     250   Township of Jennings Rev., 5.00%, 11/1/23 NR/NR   228,722     500   Univ. Place Transportation Dev. Dist., Special Assessment, 5.00%, 3/1/32 (d) NR/NR   444,760               13,277,187        

Montana–1.3%

          11,250   Forsyth Pollution Control Rev., Puget Sound Energy, 5.00%, 3/1/31 (AMBAC) Aaa/AAA   11,579,400        

Nevada–0.4%

          3,355   Henderson Health Care Facs. Rev., Catholic Healthcare West,
5.125%, 7/1/28, (Pre-refunded @ $101, 7/1/08) (b) A2/NR   3,423,912  




PIMCO Municipal Income Fund III 
Schedule of Investments
December 31, 2007 (unaudited) (continued)


Principal
Amount
(000)   Credit Rating
(Moody’s/S&P) Value*      

New Hampshire–0.5%

              Manchester Water Works Rev. (FGIC),         $ 1,500   5.00%, 12/1/28 Aaa/AAA $ 1,551,840     3,250   5.00%, 12/1/34 Aaa/AAA   3,345,258               4,897,098        

New Jersey–5.7%

          1,000   Camden Cnty., Improvement Auth. Rev., Cooper Health System,
5.00%, 2/15/35, Ser. A Baa3/BBB   876,480         Economic Dev. Auth. Rev.,           4,500   Kapkowski Road Landfill Project, Special Assessment,
6.50%, 4/1/28 Baa3/NR   4,959,495     300   Newark Airport Rev., 7.00%, 10/1/14 Ba1/NR   301,485     450   Seashore Gardens, 5.375%, 11/1/36 NR/NR   388,035         Health Care Facs. Financing Auth. Rev.,           2,500   Middlesex Cnty. Pollution Control Auth. Rev., 5.75%, 9/15/32 Baa3/BBB−   2,500,775     3,000   Pascack Valley Hospital, 6.625%, 7/1/36 (j) NR/CC   1,531,500     2,000   Somerset Medical Center, 5.50%, 7/1/33 Ba1/NR   1,791,300     2,000   South Port Corp., 5.10%, 1/1/33 NR/A   2,043,240     1,000   St. Peters Univ. Hospital, 5.75%, 7/1/37 Baa2/BBB−   975,060     1,150   Trinitas Hospital, 5.25%, 7/1/30, Ser. A Baa3/BBB−   1,061,588     1,500   State Educational Facs. Auth. Rev., 6.00%, 7/1/25, Ser. D NR/NR   1,544,850         Tobacco Settlement Financing Corp. Rev.,           22,645   5.00%, 6/1/41, Ser. 1A Baa3/BBB   18,830,903     525   6.00%, 6/1/37, (Pre-refunded @ $100, 6/1/12) (b) Aaa/AAA   582,466     1,000   6.125%, 6/1/24 Aaa/AAA   1,062,750     230   6.125%, 6/1/42, (Pre-refunded @ $100, 6/1/12) (b) Aaa/AAA   256,346     350   6.25%, 6/1/43, (Pre-refunded @ $100, 6/1/13) (b) Aaa/AAA   399,259     10,750   6.75%, 6/1/39, (Pre-refunded @ $100, 6/1/13) (b) Aaa/AAA   12,526,545               51,632,077        

New Mexico–0.1%

          1,000   Farmington Pollution Control Rev., 5.80%, 4/1/22 Baa2/BBB−   1,002,310        

New York–3.6%

          10,000   Metropolitan Transportation Auth. Rev., 5.25%, 11/15/32, Ser. B, (Pre-refunded @ $100, 11/15/13) (b) A2/AAA   11,054,000         New York City Municipal Water Finance Auth., Water & Sewer System Rev.,           5,000   5.00%, 6/15/35, Ser. C Aa2/AA+   5,146,900     8,180   5.00%, 6/15/37, Ser. D (i) Aa2/AA+   8,441,433     1,500   5.00%, 6/15/39, Ser. A Aa2/AA+   1,542,375     3,800   State Dormitory Auth. Rev., State Personal Income Tax, 5.00%, 3/15/32, (Pre-refunded @ $100, 3/15/13) (b) Aa3/AAA   4,113,576     2,000   State Environmental Facs. Corp. Rev., 5.00%, 6/15/28 Aaa/AAA   2,076,160               32,374,444        

North Carolina–1.3%

          2,000   Charlotte-Mecklenburg Hospital Auth., Healthcare System Rev.,
5.00%, 1/15/33, Ser. A, (Pre-refunded @ $100, 1/15/13) (b) Aa3/AA−   2,148,720  




PIMCO Municipal Income Fund III 
Schedule of Investments
December 31, 2007 (unaudited) (continued)


Principal
Amount
(000)   Credit Rating
(Moody’s/S&P) Value*      

North Carolina–(continued)

              Eastern Municipal Power Agcy., Power System Rev.,         $ 2,000   5.125%, 1/1/23, Ser. D Baa1/BBB $ 2,034,760     2,000   5.125%, 1/1/26, Ser. D Baa1/BBB   2,022,340     3,795   5.375%, 1/1/17, Ser. C Baa1/BBB   3,964,371     1,500   Medical Care Commission, Health Care Facs. Rev., Cleveland Cnty., 5.00%, 7/1/35 (AMBAC) Aaa/AAA   1,542,660               11,712,851        

Ohio–1.4%

          5,000   Buckeye Tobacco Settlement Financing Auth. Rev., 5.875%, 6/1/47, Ser. A-2 Baa3/BBB   4,775,300     2,500   Lorain Cnty. Hospital Rev., Catholic Healthcare, 5.375%, 10/1/30 A1/AA−   2,540,000     5,000   Ohio Air Quality Dev. Auth. Rev., Dayton Power & Light Co.,
4.80%, 1/1/34, Ser. B (FGIC)(i) Aaa/AAA   4,977,900               12,293,200        

Pennsylvania–4.0%

              Allegheny Cnty. Hospital Dev. Auth. Rev.,           11,300   5.375%, 11/15/40, Ser. A Ba2/BB   9,786,365     4,350   9.25%, 11/15/30, Ser. B, (Pre-refunded @ $102, 11/15/10) (b) Ba3/AAA   5,130,694     1,500   Cumberland Cnty. Auth., Retirement Community Rev., Wesley Affiliated Services, 7.25%, 1/1/35, Ser. A, (Pre-refunded @ $101, 1/1/13) (b) NR/NR   1,773,480     3,250   Delaware River Toll Bridge, Commission Bridge Rev., 5.00%, 7/1/28 A2/A−   3,337,815     1,250   Harrisburg Auth. Rev., 6.00%, 9/1/36 NR/NR   1,224,762     3,000   Lehigh Cnty. General Purpose Auth. Rev., St. Luke’s Bethlehem Hospital,5.375%, 8/15/33, (Pre-refunded @ $100, 8/15/13) (b) Baa1/BBB   3,295,560     5,000   Philadelphia School Dist., GO, 5.125%, 6/1/34, Ser. D, (Pre-refunded @ $100, 6/1/14) (FGIC)(b) Aaa/AAA   5,495,750     6,300   St. Mary Hospital Auth., Bucks Cnty. Rev.,5.00%, 12/1/28, (Partially Pre-refunded @ $101, 6/1/08) (b) Aa2/NR   6,203,358               36,247,784        

Puerto Rico–0.3%

              Electric Power Auth. Power Rev.,           2,200   5.125%, 7/1/29, Ser. NN, (Pre-refunded @ $100, 7/1/13) (b) A3/BBB+   2,402,466        

South Carolina–1.7%

          7,500   Florence Cnty. Rev., McLeod Regional Medical Center, 5.00%, 11/1/31, Ser. A (FSA) Aaa/AAA   7,784,775         Jobs Economic Dev. Auth. Rev., Bon Secours Health System,           6,700   5.625%, 11/15/30 A3/A−   6,817,652     750   6.00%, 11/15/37, Ser. A NR/NR   685,208               15,287,635        

South Dakota–0.2%

          1,705   Minnehaha Cnty. Health Facs. Rev., Bethany Lutheran, 5.375%, 12/1/27 NR/NR   1,554,363  




PIMCO Municipal Income Fund III 
Schedule of Investments
December 31, 2007 (unaudited) (continued)


Principal
Amount
(000)   Credit Rating
(Moody’s/S&P) Value*      

Tennessee–0.1%

        $ 1,250   Knox Cnty. Health Educational & Housing Facs., Board Hospital Facs. Rev., Catholic Healthcare Partners, 5.25%, 10/1/30 A1/AA− $ 1,263,475        

Texas–14.3%

          2,500   Columbia & Brazoria Independent School Dist., GO, 5.00%, 8/1/29 (PSF-GTD) NR/AAA   2,575,850     1,300   Comal Cnty. Health Facs. Dev., McKenna Memorial Hospital Project Rev., 6.25%, 2/1/32 Baa2/BBB−   1,317,927     6,810   Crowley Independent School Dist., GO, 4.75%, 8/1/35 (PSF-GTD)(i) Aaa/AAA   6,839,896     12,975   Dallas Area Rapid Transit Rev., 5.00%, 12/1/32, (Pre-refunded @ $100, 12/1/12) (FGIC)(b)(i) Aaa/AAA   14,003,269         Denton Independent School Dist., GO, (PSF-GTD),           5,745   zero coupon, 8/15/26, (Pre-refunded @ $44.73, 8/15/12) (b) Aaa/AAA   2,190,568     255   zero coupon, 8/15/26 Aaa/AAA   93,223     5,745   zero coupon, 8/15/27, (Pre-refunded @ $42.17, 8/15/12) (b) Aaa/AAA   2,065,213     255   zero coupon, 8/15/27 Aaa/AAA   87,733     4,785   zero coupon, 8/15/28, (Pre-refunded @ $39.75, 8/15/12) (b) Aaa/AAA   1,621,397     215   zero coupon, 8/15/28 Aaa/AAA   69,598     5,745   zero coupon, 8/15/29, (Pre-refunded @ $37.46, 8/15/12) (b) Aaa/AAA   1,834,551     255   zero coupon, 8/15/29 Aaa/AAA   77,688     1,915   zero coupon, 8/15/30, (Pre-refunded @ $35.30, 8/15/12) (b) Aaa/AAA   576,185     85   zero coupon, 8/15/30 Aaa/AAA   24,367     7,660   zero coupon, 8/15/31, (Pre-refunded @ $33.25, 8/15/12) (b) Aaa/AAA   2,171,227     340   zero coupon, 8/15/31 Aaa/AAA   91,735     10,115   5.00%, 8/15/33 (i) Aaa/AAA   10,340,059     4,400   Harris Cnty., GO, 5.125%, 8/15/31, (Pre-refunded @ $100, 8/15/12) (b) Aa1/AA+   4,748,744         Harris Cnty. Health Facs. Dev. Corp. Rev.,           5,000   Christus Health, 5.375%, 7/1/29, Ser. A, (Pre-refunded @ $101, 7/1/09) (MBIA)(b) Aaa/AAA   5,219,050     2,750   St. Luke’s Episcopal Hospital, 5.375%, 2/15/26, Ser. A, (Pre-refunded @ $100, 8/15/11) (b) NR/AAA   2,954,435     19,500   Harris Cnty. Rev., 5.125%, 8/15/32, (Pre-refunded @ $100, 8/15/12) (FSA)(b) Aaa/AAA   21,062,925     5,000   Houston Water & Sewer System Rev.,5.00%, 12/1/30, Ser. A, (Pre-refunded @ $100, 12/1/12) (FSA)(b) Aaa/AAA   5,391,550         Judson Independent School Dist., GO, (PSF-GTD),           6,535   5.00%, 2/1/30, (Pre-refunded @ $100, 2/1/11) (b) Aaa/NR   6,884,557     465   5.00%, 2/1/30 Aaa/NR   472,793     11,950   Mansfield Independent School Dist., GO, 5.00%, 2/15/28 (PSF-GTD)(i) Aaa/AAA   12,296,670         Mesquite Independent School Dist. No. 1, GO, Ser. A (PSF-GTD),           1,365   zero coupon, 8/15/16 NR/AAA   949,535     1,000   zero coupon, 8/15/18 NR/AAA   625,510     1,000   zero coupon, 8/15/19 NR/AAA   586,880     1,000   zero coupon, 8/15/20 NR/AAA   553,240     2,105   Northwest Harris Cnty. Municipal Utility Dist. No. 16, GO, 5.30%, 10/1/29 (Radian) NR/AA   2,127,271  




PIMCO Municipal Income Fund III 
Schedule of Investments
December 31, 2007 (unaudited) (continued)


Principal
Amount
(000)   Credit Rating
(Moody’s/S&P) Value*      

Texas–(continued)

        $ 2,000   Sabine River Auth. Rev., 5.20%, 5/1/28 NR/CCC $ 1,640,600         Univ. Rev., Ser. B (b),           2,000   5.00%, 7/1/26, (Pre-refunded @ $100, 7/1/14) Aaa/AAA   2,186,220     11,115   5.00%, 8/15/33, (Pre-refunded @ $100, 8/15/13) (i) Aaa/AAA   12,069,778     2,500   Willacy Cnty. Rev., 6.875%, 9/1/28, Ser. A-1 NR/NR   2,609,200               128,359,444        

Utah–0.3%

          750   Spanish Fork City Rev., 5.70%, 11/15/36 NR/NR   696,045     720   Utah Cnty. Lincoln Academy Charter School, GO, 5.875%, 6/15/37, Ser. A (c) NR/NR   685,678     1,750   Weber Cnty., IHC Health Services Rev., 5.00%, 8/15/30 Aa1/NR   1,757,367               3,139,090        

Virginia–0.1%

          1,000   James City Cnty. Economic Dev. Auth. Rev., 5.50%, 7/1/37, Ser. A NR/NR   887,320        

Washington–10.2%

          6,375   Chelan Cnty. Public Utility Dist. Rev., 5.125%, 7/1/33, Ser. C (AMBAC) Aaa/AAA   6,566,760         King Cnty. Sewer Rev., Ser. A (i),           10,000   5.00%, 1/1/35 (FGIC) Aaa/AAA   10,226,200     15,000   5.00%, 1/1/35 (FSA) Aaa/AAA   15,326,100     21,625   Port Tacoma, GO, 5.00%, 12/1/33, (Pre-refunded @ $100, 12/1/13) (AMBAC)(b)(i) Aaa/AAA   23,571,034     10,000   Seattle Drain & Wastewater Rev., 5.00%, 7/1/32 (FGIC)(i) Aaa/AAA   10,213,500     3,400   State Housing Finance Commission Rev., Skyline at First Hill, 5.625%, 1/1/38, Ser. A NR/NR   3,017,636     22,415   Tobacco Settlement Auth., Tobacco Settlement Rev., 6.50%, 6/1/26 Baa3/BBB   23,343,653               92,264,883        

Wisconsin–0.1%

          560   Badger Tobacco Asset Securitization Corp. Rev., 6.00%, 6/1/17 Baa3/BBB   580,535     700   Milwaukee Redev. Auth. Rev., 5.65%, 8/1/37, Ser. A NR/NR   641,018               1,221,553         Total Municipal Bond & Notes (cost—$847,822,704)     879,209,505  

VARIABLE RATE NOTES (f)–2.0%

     

Florida–0.3%

          2,554   State Turnpike Auth. Rev., 9.02%, 7/1/31, Ser. 1450 (a)(c)(e) Aa2/NR   2,666,121        

New York–1.5%

          4,660   Liberty Dev. Corp. Rev., 11.60%, 10/1/35, Ser. 1451 (a)(c)(e) Aa3/NR   5,851,562  




PIMCO Municipal Income Fund III 
Schedule of Investments
December 31, 2007 (unaudited) (continued)


Principal
Amount
(000)   Credit Rating
(Moody’s/S&P) Value*      

New York–(continued)

        $ 6,000   State Dormitory Auth. Rev., Univ. & College Improvement.,               10.23%, 3/15/35, Ser. 1216 (a)(c)(e) NR/AAA $ 7,154,400               13,005,962        

Ohio–0.2%

          2,075   Ohio Air Quality Dev. Auth. Rev., 8.47%, 1/1/34, Ser. 1223 (FGIC)(a)(c)(e) Aaa/NR   2,044,435        

Pennsylvania–0.0%

          350   Washington Cnty. Redev. Auth., Tax Allocation, 5.45%, 7/1/35, Ser. A NR/NR   319,245         Total Variable Rate Notes (cost–$18,715,469)     18,035,763  

U.S. TREASURY BILLS (g)–0.5%

  4,425   2.99%-3.21%, 2/28/08-3/13/08 (cost–$4,399,478)     4,399,478         Total Investments before options written (cost–$870,937,651)–100.1%   901,644,746                   Contracts          

OPTIONS WRITTEN (h)–(0.1)%

     

Call Options–(0.1)%

              U.S. Treasury Notes 10 yr. Futures (CBOT),           761   strike price $114, expires 2/22/08     (856,125 )       

Put Options–(0.0)%

              U.S. Treasury Notes 10 yr. Futures (CBOT),           761   strike price $110, expires 2/22/08     (190,250 )        Total Options Written (premiums received–$1,050,188)     (1,046,375 )        Total Investments net of options written (cost–$869,887,463)–100.0% $ 900,598,371  




Notes to Schedule of Investments:

* Portfolio securities and other financial instruments for which market quotations are readily available are stated at market value. Portfolio securities and other financial instruments for which market quotations are not readily available or if a development/event occurs that may significantly impact the value of a security are fair-valued, in good faith, pursuant to guidelines established by the Board of Trustees or persons acting at their discretion pursuant to guidelines established by the Board of Trustees. The Fund’s investments are valued daily using prices supplied by an independent pricing service or dealer quotations, or by using the last sale price on the exchange that is the primary market for such securities, or the last quoted mean price for those securities for which the over-the-counter market is the primary market or for listed securities in which there were no sales. Independent pricing services use information provided by market makers or estimates of market values obtained from yield data relating to investments or securities with similar characteristics. Exchange traded options and futures are valued at the settlement price determined by the relevant exchange. Securities purchased on a when-issued or delayed-delivery basis are marked to market daily until settlement at the forward settlement date. Short-term investments maturing in 60 days or less are valued at amortized cost, if their original term to maturity was 60 days or less, or by amortizing their value on the 61st day prior to maturity, if the original term to maturity exceeded 60 days. The prices used by the Fund to value securities may differ from the value that would be realized if the securities were sold. The Fund’s net asset value is normally determined as of the close of regular trading (normally, 4:00 p.m. Eastern time) on the New York Stock Exchange (‘‘NYSE’’) on each day the NYSE is open for business. (a) Private Placement – Restricted as to resale and may not have a readily available market. Securities with an aggregate value of $17,716,518, representing 1.97% of total investments. (b) Pre-refunded bonds are collateralized by U.S. Government or other eligible securities which are held in escrow and used to pay principal and interest and retire the bonds at the earliest refunding date (payment date) and/or whose interest rates vary with changes in a designated base rate (such as the prime interest rate). (c) 144A Security – Security exempt from registration, under Rule 144A of the Securities Act of 1933. These securities may be resold in transactions exempt from registration, typically only to qualified institutional buyers. Unless otherwise indicated, these securities are not considered to be illiquid. (d) When-issued or delayed-delivery security. To be settled/delivered after December 31, 2007. (e) Inverse Floater – The interest rate shown bears an inverse relationship to the interest rate on another security or the value of an index. (f) Variable Rate Notes – Instruments whose interest rates change on specified date (such as a coupon date or interest payment date) and/or whose interest rates vary with changes in a designated base rate (such as the prime interest rate). The interest rate disclosed reflects the rate in effect on December 31, 2007. (g) All or partial amount segregated as collateral for futures contracts. (h) Non-income producing. (i) Residual Interest Bonds held in trust – Securities represent underlying bonds transferred to a separate securitization trust established in a tender option bond transaction in which the Fund acquired the residual interest certificates. These securities serve as collateral in a financing transaction. (j) Security in default.

Glossary:

AMBAC – insured by American Municipal Bond Assurance Corp. CBOT – Chicago Board of Trade CP – Certificates of Participation FGIC – insured by Financial Guaranty Insurance Co. FSA – insured by Financial Security Assurance, Inc. GNMA – insured by Government National Mortgage Association GO – General Obligation Bond MBIA – insured by Municipal Bond Investors Assurance NR – Not Rated



PSF-GTD – Public School Fund-Guaranteed Radian – insured by Radian Guaranty, Inc. XLCA – insured by XL Capital Assurance

Other Investments:

(1) Futures contracts outstanding at December 31, 2007:


Type Contracts Market
Value
(000)
Expiration
Date
Unrealized
Appreciation
Long: U.S. Treasury Notes 10 yr. Futures      31 $ 3,515 3/19/08 $ 31,000 Short: U.S. Treasury Bond Futures (1,456) (169,442 )  3/19/08 1,274,859           $ 1,305,859

(2) Transactions in options written for the three months ended December 31, 2007:


  Contracts Premiums Options outstanding, September 30, 2007 $— Options written 1,522 1,050,188 Options outstanding, December 31, 2007 1,522 $1,050,188




Item 2. Controls and Procedures

(a)  The registrant’s President and Chief Executive Officer and Principal Financial Officer have concluded that the registrant’s disclosure controls and procedures (as defined in Rule 30a-2(c) under the Act (17CFR270.30a -3(c)), are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this document. (b)  There were no significant changes in the registrant’s internal controls over financial reporting (as defined in Rule 30a-3(d)) under the Act (17 CFR270.30a -3(d)) that occurred during the registrant’s last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

Item 3. Exhibits

(a)  Exhibit 99.302 Cert. – Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002



SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Registrant: PIMCO Municipal Income Fund III

By /s/ Brian S. Shlissel
President & Chief Executive Officer

Date: February 29, 2008

By /s/ Lawrence G. Altadonna
Treasurer, Principal Financial & Accounting Officer

Date: February 29, 2008

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dated indicated.

By /s/ Brian S. Shlissel
President & Chief Executive Officer

Date: February 29, 2008

By /s/ Lawrence G. Altadonna
Treasurer, Principal Financial & Accounting Officer

Date: February 29, 2008