UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number 811-09571

Nuveen Senior Income Fund

(Exact name of registrant as specified in charter)

     333 West Wacker Drive, Chicago, Illinois 60606     
(Address of principal executive offices) (Zip code)

Kevin J. McCarthy—Vice President and Secretary
     333 West Wacker Drive, Chicago, Illinois 60606     
(Name and address of agent for service)

Registrant’s telephone number, including area code:      312-917-7700     

Date of fiscal year end:        7/31      

Date of reporting period:    10/31/2008   

Form N-Q is to be used by management investment companies, other than small business investment companies 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 respond 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

Nuveen Senior Income Fund (NSL)
October 31, 2008

						Weighted
Principal						Average
Amount (000)				Description (1)		Coupon		Maturity (2)		Ratings (3)		Value
				Variable Rate Senior Loan Interests – 164.2% (97.9% of Total Investments) (4)
				Aerospace & Defense – 3.7% (2.2% of Total Investments)
$	574			DAE Aviation Holdings, Inc., Term Loan B-1		7.366%		7/31/14		BB-		$	427,979
	568			DAE Aviation Holdings, Inc., Term Loan B-2		7.170%		7/31/14		BB-			422,968
	2,483			Midwestern Aircraft, Term Loan B		6.500%		12/30/11		BBB-			2,116,971
	2,368			Vought Aircraft Industries, Inc., Term Loan		5.620%		12/22/11		Ba3			1,882,492
	545			Vought Aircraft Industries, Inc., Tranche B, Letter of Credit		6.426%		12/22/10		Ba3			409,091
	6,538			Total Aerospace & Defense									5,259,501
				Airlines – 4.5% (2.7% of Total Investments)
	1,980			Delta Air Lines, Inc., Credit Linked Deposit		4.891%		4/30/12		Ba2			1,401,840
	1,975			Delta Air Lines, Inc., Term Loan		6.250%		4/30/14		B			1,135,625
	2,586			Northwest Airlines, Inc., DIP Term Loan		5.000%		8/21/13		BB-			2,104,762
	3,112			United Air Lines, Term Loan B		5.653%		2/01/14		B+			1,789,272
	9,653			Total Airlines									6,431,499
				Auto Components – 3.6% (2.1% of Total Investments)
	1,981			Federal-Mogul Corporation, Tranche B, Term Loan		5.274%		12/29/14		Ba2			1,206,235
	1,011			Federal-Mogul Corporation, Tranche C, Term Loan		6.060%		12/28/15		Ba2			615,426
	456			Gen Tek Inc., Additional Term Loan B		6.211%		2/28/11		BB-			390,781
	1,694			Gen Tek Inc., Term Loan B		6.299%		2/28/11		BB-			1,452,891
	2,000			Goodyear Tire & Rubber Company, Term Loan		4.780%		4/30/14		Ba1			1,423,333
	7,142			Total Auto Components									5,088,666
				Building Products – 8.5% (5.1% of Total Investments)
	787			Atrium Companies, Inc., Term Loan		8.724%		5/31/12		B			472,199
	5,925			Building Materials Corporation of America, Term Loan		6.625%		2/22/14		B+			4,135,937
	2,000			Building Materials Corporation of America, Term Loan, Second Lien		9.000%		9/15/14		Caa2			1,044,000
	2,438			Euramax Holdings, Inc., Term Loan		7.500%		6/29/12		B			1,259,551
	2,415			Stile Acquisition Corporation, Canadian Term Loan		5.000%		4/05/13		Caa2			1,668,306
	2,391			Stile Acquisition Corporation, Term Loan B		5.500%		4/05/13		Caa2			1,652,237
	1,960			TFS Acquisition, Term Loan		7.262%		8/11/13		B+			1,822,800
	17,916			Total Building Products									12,055,030
				Chemicals – 4.7% (2.8% of Total Investments)
	2,940			Hexion Specialty Chemicals, Inc., Term Loan C-4		5.063%		5/05/13		Ba3			2,045,750
	716			Huntsman International LLC, Term Loan		4.969%		4/19/14		BB+			622,295
	916			Ineos US Finance LLC, Tranche B2		5.950%		12/16/13		BB-			509,674
	916			Ineos US Finance LLC, Tranche C2		6.450%		12/16/14		BB-			501,293
	1,975			ISP Chemco, Inc., Term Loan		5.065%		6/04/14		BB-			1,560,250
	1,985			Univar, Inc., Term Loan		6.762%		10/10/14		B+			1,391,981
	9,448			Total Chemicals									6,631,243
				Commercial Services & Supplies – 2.0% (1.2% of Total Investments)
	1,845			Acco Brands Corporation, Term Loan B		5.207%		8/17/12		Ba1			1,291,500
	1,765			Rental Services Corporation, Term Loan		7.699%		11/27/13		B-			1,089,654
	592			Workflow Holdings Corporation, Term Loan		8.420%		11/30/11		B+			406,953
	4,202			Total Commercial Services & Supplies									2,788,107
				Containers & Packaging – 2.8% (1.6% of Total Investments)
	3,439			Graham Packaging Company, L.P., Term Loan		5.744%		10/07/11		B+			2,816,509
	437			Smurfit-Stone Container Corporation, Deposit-Funded Commitment		5.926%		11/01/10		BB			347,137
	283			Smurfit-Stone Container Corporation, Term Loan B		4.897%		11/01/11		BB			224,639
	469			Smurfit-Stone Container Corporation, Term Loan C		4.883%		11/01/11		BB			372,471
	168			Smurfit-Stone Container Corporation, Tranche C-1		5.125%		11/01/11		BB			133,237
	4,796			Total Containers & Packaging									3,893,993
				Diversified Consumer Services – 3.1% (1.9% of Total Investments)
	3,960			Cengage Learning Acquisitions, Inc., Term Loan		5.620%		7/05/14		B+			2,972,202
	2,261			West Corporation, Term Loan		5.512%		10/24/13		BB-			1,464,153
	6,221			Total Diversified Consumer Services									4,436,355
				Diversified Financial Services – 1.1% (0.7% of Total Investments)
	2,000			Fox Acquisition Sub LLC, Term Loan B		7.250%		7/14/15		BB-			1,580,000
				Diversified Telecommunication Services – 5.2% (3.1% of Total Investments)
	1,970			Crown Castle Operating Company, Term Loan		5.376%		1/26/14		BB+			1,509,020
	2,000			Intelsat, Term Loan		6.834%		2/01/14		BB-			1,675,000
	1,936			Intelsat, Tranche B, Term Loan		6.650%		7/01/13		BB-			1,604,046
	329			Intelsat, Tranche B, Term Loan A		6.650%		1/03/14		BB-			273,237
	329			Intelsat, Tranche B, Term Loan B		6.650%		1/03/14		BB-			273,155
	329			Intelsat, Tranche B, Term Loan C		6.650%		1/03/14		BB-			273,155
	2,267			Level 3 Financing, Inc., Term Loan		7.000%		3/13/14		B+			1,694,333
	5,000			WCI Capital Corporation, Term Loan B, (5) (6)		0.000%		9/30/07		N/R			50,000
	14,160			Total Diversified Telecommunication Services									7,351,946
				Electric Utilities – 5.3% (3.2% of Total Investments)
	403			Calpine Corporation, DIP Revolver, (7)		4.397%		3/31/14		B+			275,000
	4,211			Calpine Corporation, DIP Term Loan		6.645%		3/31/14		B+			3,388,523
	2,970			TXU Corporation, Term Loan B-2		6.659%		10/10/14		Ba3			2,329,800
	1,980			TXU Corporation, Term Loan B-3		6.437%		10/10/14		Ba3			1,545,885
	9,564			Total Electric Utilities									7,539,208
				Electrical Equipment – 2.3% (1.4% of Total Investments)
	2,929			Allison Transmission Holdings, Inc., Term Loan		5.669%		8/07/14		BB-			2,011,552
	1,409			Sensus Metering Systems, Inc., Term Loan B-1		4.919%		12/17/10		BB			1,303,043
	4,338			Total Electrical Equipment									3,314,595
				Electronic Equipment & Instruments – 0.9% (0.5% of Total Investments)
	1,955			Sensata Technologies B.V., Term Loan		5.257%		4/27/13		BB			1,262,930
				Energy Equipment & Services – 1.3% (0.7% of Total Investments)
	2,442			Dresser-Rand Group, Inc., Term Loan		5.070%		5/04/14		B+			1,777,316
				Food Products – 2.9% (1.7% of Total Investments)
	465			Dole Food Company, Inc., Deposit-Funded Commitment		6.689%		4/12/13		Ba3			340,892
	824			Dole Food Company, Inc., Term Loan B		5.277%		4/12/13		Ba3			604,201
	3,401			Dole Food Company, Inc., Term Loan C		5.926%		4/12/13		Ba3			2,492,770
	772			Michael Foods, Inc., Term Loan B		4.867%		11/21/10		BB-			682,966
	5,462			Total Food Products									4,120,829
				Health Care Equipment & Supplies – 0.9% (0.6% of Total Investments)
	946			Symbion, Inc., Term Loan A		6.559%		8/01/13		Ba3			652,740
	946			Symbion, Inc., Term Loan B		6.559%		8/01/14		Ba3			652,740
	1,892			Total Health Care Equipment & Supplies									1,305,480
				Health Care Providers & Services – 9.9% (5.9% of Total Investments)
	3,777			Health Management Associates, Inc., Term Loan		5.512%		2/28/14		BB-			2,662,617
	766			HealthSouth Corporation, Term Loan		5.500%		3/10/13		BB-			636,932
	463			IASIS Healthcare LLC, Delayed Term Loan		5.118%		3/14/14		Ba2			374,764
	124			IASIS Healthcare LLC, Letter of Credit		2.481%		3/14/14		Ba2			100,188
	1,337			IASIS Healthcare LLC, Term Loan		5.118%		3/14/14		Ba2			1,083,066
	3,880			LifeCare, Term Loan B		7.670%		8/11/12		B2			2,735,400
	2,133			Psychiatric Solutions, Inc., Term Loan B		4.796%		7/01/12		BB-			1,751,384
	2,895			Select Medical Corporation, Term Loan		4.911%		2/24/12		Ba2			2,229,150
	2,823			Vanguard Health Holding Company II LLC, Replacement Term Loan		5.743%		9/23/11		Ba3			2,410,079
	18,198			Total Health Care Providers & Services									13,983,580
				Hotels, Restaurants & Leisure – 15.1% (9.0% of Total Investments)
	4,875			24 Hour Fitness Worldwide, Inc., Term Loan B		6.179%		6/08/12		Ba3			3,631,875
	1,761			Ameristar Casinos, Inc., Term Loan B		5.769%		11/10/12		BB+			1,012,570
	1,411			Buffets, Inc., DIP Term Loan, (5)		12.250%		1/22/09		N/R			1,417,937
	765			CBRL Group, Inc., Term Loan B-1		4.300%		4/28/13		BB-			587,703
	92			CBRL Group, Inc., Term Loan B-2		4.300%		4/28/13		BB-			70,680
	3,728			CCM Merger, Inc., Term Loan B		5.284%		7/13/12		BB-			2,292,505
	1,955			Cedar Fair LP, Term Loan		5.118%		8/30/12		BB			1,436,925
	1,000			Fontainebleau Las Vegas LLC, Delayed Term Loan, (7) (8)		2.000%		6/06/14		B1			(525,000	)
	2,000			Fontainebleau Las Vegas LLC, Term Loan		6.065%		6/06/14		B1			950,000
	1,162			Isle of Capri Casinos, Inc., Delayed Term Loan		5.512%		11/25/13		BB			788,064
	350			Isle of Capri Casinos, Inc., Delayed Term Loan A		5.512%		11/25/13		BB			237,616
	465			Isle of Capri Casinos, Inc., Delayed Term Loan B		5.512%		11/25/13		BB			315,226
	1,880			Penn National Gaming, Inc., Term Loan B		5.009%		10/03/12		BB+			1,571,890
	1,000			QCE LLC, Term Loan		9.512%		11/05/13		N/R			592,500
	117			Seminole Gaming, Delayed Term Loan B-1		5.198%		3/05/14		BBB			93,506
	420			Seminole Gaming, Delayed Term Loan B-2		5.313%		3/05/14		BBB			336,674
	387			Seminole Gaming, Delayed Term Loan B-3		5.313%		3/05/14		BBB			309,634
	988			Travelport LLC, Delayed Term Loan		5.368%		8/23/13		BB-			602,375
	268			Travelport LLC, Letter of Credit		6.012%		8/23/13		BB-			166,335
	1,334			Travelport LLC, Term Loan		6.012%		8/23/13		BB-			828,980
	798			Venetian Casino Resort LLC, Delayed Term Loan		5.520%		5/23/14		BB-			459,050
	3,160			Venetian Casino Resort LLC, Term Loan		5.520%		5/23/14		BB-			1,817,790
	2,444			Wintergames Holdings, Term Loan		6.250%		10/23/08		N/R			2,321,382
	32,360			Total Hotels, Restaurants & Leisure									21,316,217
				Household Durables – 0.9% (0.5% of Total Investments)
	814			Shea Homes, Inc., Term Loan		5.250%		10/27/11		N/R			406,782
	990			William Carter Company, Term Loan B		4.756%		7/14/12		BBB-			834,442
	1,804			Total Household Durables									1,241,224
				Household Products – 2.3% (1.4% of Total Investments)
	1,460			Prestige Brands, Inc., Term Loan B		5.822%		4/06/11		BB-			1,175,639
	2,458			Solo Cup Company, Term Loan		6.653%		2/27/11		B			2,136,235
	3,918			Total Household Products									3,311,874
				Independent Power Producers & Energy Traders – 0.6% (0.3% of Total Investments)
	329			Covanta Energy Corporation, Synthetic Letter of Credit		5.453%		2/09/14		BB			274,084
	661			Covanta Energy Corporation, Term Loan B		4.632%		2/09/14		BB			550,865
	990			Total Independent Power Producers & Energy Traders									824,949
				Insurance – 2.7% (1.6% of Total Investments)
	5,873			Conseco, Inc., Term Loan		5.000%		10/10/13		B+			3,890,785
				IT Services – 4.8% (2.9% of Total Investments)
	2,970			First Data Corporation, Term Loan B-1		6.053%		9/24/14		BB-			2,193,716
	2,000			Infor Global Solutions, Intermediate Holdings, Ltd., Term Loan B-1, WI/DD		TBD		TBD		Caa2			725,000
	5,054			SunGard Data Systems, Inc., Term Loan B		4.553%		2/28/14		BB			3,895,379
	10,024			Total IT Services									6,814,095
				Leisure Equipment & Products – 4.5% (2.7% of Total Investments)
	2,734			Bombardier Recreational Products, Inc., Term Loan		6.347%		6/28/13		B+			1,893,418
	1,717			Herbst Gaming, Inc., Delayed Term Loan		10.500%		12/02/11		CCC-			953,046
	3,250			Herbst Gaming, Inc., Term Loan		10.500%		12/02/11		CCC-			1,803,736
	3,686			Wimar OpCo LLC, Term Loan, (5)		7.250%		1/03/12		N/R			1,710,857
	11,387			Total Leisure Equipment & Products									6,361,057
				Machinery – 4.4% (2.6% of Total Investments)
	1,156			Navistar International Corporation, Synthetic Letter of Credit		6.242%		1/19/12		BB-			808,889
	3,178			Navistar International Corporation, Term Loan		6.421%		1/19/12		BB-			2,224,444
	1,780			Oshkosh Truck Corporation, Term Loan		4.503%		12/06/13		BB+			1,241,550
	554			Rexnord Corporation, Incremental Term Loan		5.762%		7/19/13		Ba2			440,611
	1,869			Rexnord Corporation, Term Loan		6.370%		7/19/13		Ba2			1,495,082
	8,537			Total Machinery									6,210,576
				Media – 21.6% (12.9% of Total Investments)
	4,396			American Media Operations, Inc., Term Loan		7.560%		1/13/13		B			2,956,451
	1,572			Carmike Cinemas, Inc., Term Loan		6.470%		5/19/12		B1			1,261,540
	1,970			Cequel Communications LLC, Term Loan B, 144A		6.207%		11/05/13		BB-			1,460,809
	1,000			Charter Communications Operating Holdings LLC, Holdco Term Loan		6.262%		3/06/14		B+			653,334
	3,000			Citadel Broadcasting Corporation, Term Loan		5.395%		6/12/14		BB-			1,635,000
	2,948			Idearc, Inc., Term Loan		5.742%		11/17/14		BB			1,272,338
	3,910			Metro-Goldwyn-Mayer Studios, Inc., Term Loan B		7.012%		4/08/12		N/R			1,977,006
	4,900			Neilsen Finance LLC, Term Loan		4.803%		8/09/13		Ba3			3,572,127
	1,888			Philadelphia Newspapers, Term Loan		8.500%		6/29/13		N/R			566,461
	2,547			Regal Cinemas Corporation, Term Loan		5.262%		10/27/13		Ba2			1,925,956
	7,910			Tribune Company, Term Loan B, DD1		6.000%		6/04/14		B			3,551,579
	683			Tribune Company, Term Loan X		7.084%		6/04/09		B			537,259
	8,000			Univision Communications, Inc., Term Loan		5.250%		9/29/14		B1			4,348,000
	1,541			Univision Communications, Inc., Term Loan, Second Lien		5.500%		3/29/09		Caa1			1,352,228
	407			Valassis Communications, Inc., Delayed Term Loan		5.520%		3/02/14		BB			285,937
	1,226			Valassis Communications, Inc., Tranche B, Term Loan		5.520%		3/02/14		BB			862,352
	2,848			WMG Acquisition Corporation, Term Loan		5.064%		2/28/11		BB			2,306,858
	50,746			Total Media									30,525,235
				Metals & Mining – 5.9% (3.5% of Total Investments)
	1,965			Aleris International, Inc., Term Loan		6.313%		12/19/11		B+			1,285,437
	1,845			Amsted Industries, Inc., Delayed Term Loan		5.179%		4/08/13		BB			1,457,667
	2,541			Amsted Industries, Inc., Term Loan		6.560%		4/08/13		BB			1,956,678
	1,975			Edgen Murray II LLP, Term Loan		5.630%		5/11/14		B			1,663,938
	2,774			John Maneely Company, Term Loan		7.662%		12/08/13		B+			2,045,658
	11,100			Total Metals & Mining									8,409,378
				Oil, Gas & Consumable Fuels – 5.7% (3.4% of Total Investments)
	2,000			Alon Refining Krotz Springs, Inc., Term Loan		10.750%		7/03/14		B+			1,750,000
	550			Big West Oil LLC, Delayed Term Loan		5.250%		5/15/14		BB			371,250
	438			Big West Oil LLC, Term Loan		5.250%		5/15/14		BB			295,313
	301			Coffeyville Resources LLC, Credit Linked Deposit		6.633%		12/28/10		BB-			242,482
	971			Coffeyville Resources LLC, Term Loan D		6.632%		12/28/13		BB-			782,940
	1,995			Quicksilver Resource, Inc. Term Loan		7.735%		8/08/13		B1			1,640,888
	2,000			Venoco, Inc., Term Loan		6.813%		9/20/11		B			1,520,000
	1,995			Western Refining, Inc., Term Loan		9.171%		5/30/14		BB-			1,506,187
	10,250			Total Oil, Gas & Consumable Fuels									8,109,060
				Paper & Forest Products – 2.9% (1.7% of Total Investments)
	2,575			Georgia-Pacific Corporation, Term Loan B		4.654%		12/21/12		BB+			2,144,712
	3,960			Wilton Products, Term Loan		6.089%		11/16/14		Ba3			1,999,800
	6,535			Total Paper & Forest Products									4,144,512
				Pharmaceuticals – 1.1% (0.6% of Total Investments)
	815			Stiefel Laboratories, Inc., Delayed Term Loan		7.000%		12/28/13		BB-			664,618
	1,066			Stiefel Laboratories, Inc., Term Loan		7.000%		12/28/13		BB-			868,926
	1,881			Total Pharmaceuticals									1,533,544
				Real Estate Management & Development – 4.7% (2.8% of Total Investments)
	3,721			Capital Automotive LP, Term Loan		5.470%		12/15/10		BB+			2,370,310
	3,080			LNR Property Corporation, Term Loan B		6.040%		7/12/11		BB			1,686,300
	3,950			Realogy Corporation, Delayed Term Loan		6.829%		10/10/13		B+			2,541,230
	10,751			Total Real Estate Management & Development									6,597,840
				Road & Rail – 3.6% (2.2% of Total Investments)
	8,837			Swift Transportation Company, Inc., Term Loan		6.063%		5/10/14		B+			5,125,577
				Semiconductors & Equipment – 1.0% (0.6% of Total Investments)
	1,965			Freescale Semiconductor, Inc., Term Loan		5.470%		11/29/13		Ba1			1,344,388
				Software – 2.1% (1.3% of Total Investments)
	2,527			Dealer Computer Services, Inc., Term Loan		5.171%		10/26/12		BB			1,642,280
	992			IPC Systems, Inc., Term Loan		6.012%		5/31/14		B+			513,599
	2,000			IPC Systems, Inc., Term Loan, Second Lien		9.012%		5/31/15		CCC+			840,000
	5,519			Total Software									2,995,879
				Specialty Retail – 12.2% (7.3% of Total Investments)
	462			Blockbuster, Inc., Tranche A, Term Loan		6.790%		8/20/09		B1			379,385
	1,189			Blockbuster, Inc., Tranche B, Term Loan		6.771%		8/20/11		B1			924,385
	2,970			Burlington Coat Factory Warehouse Corporation, Term Loan, DD1		5.060%		5/28/13		B2			1,640,807
	3,848			Michaels Stores, Inc., Term Loan		5.348%		10/31/13		B			2,271,312
	1,122			Micro Warehouse, Inc., Term Loan B, (5) (6) (9)		0.000%		1/30/07		N/R			165,826
	3,763			Norwood Promotional Products, Inc., Term Loan A		9.063%		8/17/09		N/R			3,575,102
	6,220			Norwood Promotional Products, Inc., Term Loan B		6.000%		8/17/11		N/R			3,109,973
	980			Sally Holdings LLC, Term Loan		5.196%		11/16/13		BB-			768,950
	2,000			Toys “R” Us – Delaware, Inc., Term Loan B		7.059%		7/19/12		BB-			1,462,500
	4,000			TRU 2005 RE Holding Co I LLC, Term Loan		6.720%		12/08/09		B3			2,923,334
	26,554			Total Specialty Retail									17,221,574
				Textiles, Apparel & Luxury Goods – 1.2% (0.7% of Total Investments)
	2,001			Visant Holding Corporation, Term Loan C		5.171%		7/29/10		Ba1			1,668,219
				Trading Companies & Distributors – 2.1% (1.2% of Total Investments)
	1,824			Ashtead Group Public Limited Company, Term Loan		4.563%		8/31/11		Ba2			1,568,640
	393			Brenntag Holdings GmbH & Co. KG, Acquisition Facility		5.071%		1/20/14		B+			272,945
	1,607			Brenntag Holdings GmbH & Co. KG, Facility B2		5.071%		1/20/14		B+			1,117,055
	3,824			Total Trading Companies & Distributors									2,958,640
				Wireless Telecommunication Services – 2.1% (1.3% of Total Investments)
	4,000			Asurion Corporation, Term Loan		6.060%		7/03/14		N/R			2,993,332
$	344,783			Total Variable Rate Senior Loan Interests (cost $335,459,824)									232,418,233
Principal
Amount (000)				Description (1)		Coupon		Maturity		Ratings (3)		Value
				Corporate Bonds – 3.4% (2.1% of Total Investments)
				Paper & Forest Products – 0.8% (0.5% of Total Investments)
	2,000			Verso Paper Holdings LLC, Floating Rate Note, 3.750% plus three-month LIBOR		6.776%		8/01/14		B			1,170,000
				Semiconductors & Equipment – 1.6% (1.0% of Total Investments)
	100			Avago Technologies Finance Pte. Ltd., Floating Rate Note, 5.500% plus three-month LIBOR		8.526%		6/01/13		B+			85,625
	5,000			NXP BV, Floating Rate Note, 2.750% plus three-month LIBOR		5.776%		10/15/13		B-			2,218,750
	5,100			Total Semiconductors & Equipment									2,304,375
				Textiles, Apparel & Luxury Goods – 1.0% (0.6% of Total Investments)
	2,000			HanesBrands Inc., Floating Rate Note, 3.375% plus six-month LIBOR		6.496%		12/15/14		B			1,367,500
$	9,100			Total Corporate Bonds (cost $9,100,000)									4,841,875
				Total Investments (cost $344,559,824) – 167.6%									237,260,108
				Borrowings – (37.8)% (10)									(53,500,000	)
				Other Assets Less Liabilities – 2.7%									3,800,783
				Preferred Shares, at Liquidation Value – (32.5)% (10)									(46,000,000	)
				Net Assets Applicable to Common Shares – 100%								$	141,560,891

(1)		All percentages shown in the Portfolio of Investments are based on net assets applicable to Common shares unless otherwise noted.
(2)		Senior Loans generally are subject to mandatory and/or optional prepayment. Because of these mandatory prepayment conditions and because there may be significant economic incentives for a Borrower to prepay, prepayments of Senior Loans may occur. As a result, the actual remaining maturity of Senior Loans held may be substantially less than the stated maturities shown.
(3)		Ratings: Using the higher of Standard & Poor’s Group (“Standard & Poor’s”) or Moody’s Investor Service, Inc. (“Moody’s”) rating. Ratings below BBB by Standard & Poor’s or Baa by Moody’s are considered to be below investment grade.
(4)		Senior Loans generally pay interest at rates which are periodically adjusted by reference to a base short-term, floating lending rate plus an assigned fixed rate. These floating lending rates are generally (i) the lending rate referenced by the London Inter-Bank Offered Rate (“LIBOR”), or (ii) the prime rate offered by one or more major United States banks.
		Senior Loans may be considered restricted in that the Fund ordinarily is contractually obligated to receive approval from the Agent Bank and/or Borrower prior to the disposition of a Senior Loan.
(5)		At or subsequent to October 31, 2008, this issue was under the protection of the Federal Bankruptcy Court.
(6)		Non-income producing. Non-income producing, in the case of a Senior Loan, generally denotes that the issuer has defaulted on the payment of principal or interest or has filed for bankruptcy.
(7)		Position or portion of position represents an unfunded Senior Loan commitment outstanding at October 31, 2008. At October 31, 2008, the Fund had unfunded Senior Loan Commitments of $1,152,778.
(8)		Negative value represents unrealized depreciation on unfunded Senior Loan commitment outstanding at October 31, 2008.
(9)		Investment valued at fair value using methods determined in good faith by, or at the discretion of, the Board of Trustees.
(10)		Borrowings and Preferred Shares, at Liquidation Value as a percentage of Total Investments are 22.5% and 19.4%, respectively.
N/R		Not rated.
DD1		Investment or portion of investment purchased on a delayed delivery basis.
WI/DD		Purchased on a when-issued or delayed delivery basis.
144A		Investment is exempt from registration under Rule 144A of the Securities Act of 1933, as amended. These investments may only be resold in transactions exempt from registration which are normally those transactions with qualified institutional buyers.
TBD		Senior Loan purchased on a when-issued or delayed-delivery basis. Certain details associated with this purchase are not known prior to the settlement date of the transaction. In addition, Senior Loans typically trade without accrued interest and therefore a weighted average coupon rate is not available prior to settlement. At settlement, if still unknown, the Borrower or counterparty will provide the Fund with the final weighted average coupon rate and maturity date.

Fair Value Measurements

During the current fiscal period, the Fund adopted the provisions of Statement of Financial Accounting Standards No. 157 (SFAS No. 157) “Fair Value Measurements.” SFAS No. 157 defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosure about fair value measurements. In determining the value of the Fund’s investments various inputs are used. These inputs are summarized in the three broad levels listed below:

Level 1 -

Quoted prices in active markets for identical securities.

Level 2 -

Other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.).

Level 3 -

Significant unobservable inputs (including management’s assumptions in determining the fair value of investments).

The inputs or methodology used for valuing securities are not an indication of the risk associated with investing in those securities.

The following is a summary of the Fund’s fair value measurements as of October 31, 2008:

			Level 1				Level 2				Level 3				Total
Investments		$	-			$	237,094,282			$	165,826			$	237,260,108

The following is a reconciliation of the Fund’s Level 3 investments held at the beginning and end of the measurement period:

		Level 3
		Investments
Balance as of July 31, 2008		$	165,826
Gains (losses):
Net realized gains (losses)			-
Net change in unrealized appreciation (depreciation)			-
Net purchases at cost (sales at proceeds)			-
Net discounts (premiums)			-
Net transfers in to (out of) at end of period fair value			-
Balance as of October 31, 2008		$	165,826

The following information is presented on an income tax basis. Differences between amounts for financial statement and federal income tax purposes are primarily due the treatment of paydown gains and losses and timing differences in recognizing certain gains and losses on investment transactions. To the extent that differences arise that are permanent in nature, such amounts are reclassified within the capital accounts on the Statement of Assets and Liabilities presented in the annual report, based on their federal tax basis treatment; temporary differences do not require reclassification. Temporary and permanent differences do not impact the net asset value of the Fund.

At October 31, 2008, the cost of investments was $344,584,020.

Gross unrealized appreciation and gross unrealized depreciation of investments at October 31, 2008, were as follows:

Gross unrealized:
Appreciation		$	7,236
Depreciation			(107,331,148	)
Net unrealized appreciation (depreciation) of investments		$	(107,323,912	)

Item 2. Controls and Procedures.

	a.		The registrant’s principal executive and principal financial officers, or persons performing similar functions, have concluded that the registrant’s disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the “1940 Act”) (17 CFR 270.30a-3(c))) are effective, as of a date within 90 days of the filing date of this report that includes the disclosure required by this paragraph, based on their evaluation of the controls and procedures required by Rule 30a-3(b) under the 1940 Act (17 CFR 270.30a-3(b)) and Rule 13a-15(b) or 15d-15(b) under the Securities Exchange Act of 1934 (17 CFR 240.13a-15(b) or 240.15d-15(b)).
	b.		There were no changes in the registrant’s internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act (17 CFR 270.30a-3(d)) that occurred during the registrant’s last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the registrant’s internal control over financial reporting.

Item 3. Exhibits.

File as exhibits as part of this Form a separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the 1940 Act (17 CFR 270.30a-2(a)), exactly as set forth below: EX-99 CERT Attached hereto.

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)   Nuveen Senior Income Fund   

Date December 30, 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 dates indicated.

Date December 30, 2008

Date December 30, 2008