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:    10/31/2007   

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, 2007

Principal						Weighted Average
Amount (000)				Description (1)		Coupon		Maturity (2)		Ratings (3)		Value
				Variable Rate Senior Loan Interests – 146.4% (89.1% of Total Investments) (4)
				Aerospace & Defense – 3.1% (2.0% of Total Investments)
$	669			Dubai Aerospace, Term Loan Asset Sale		7.803%		7/23/09		BB-		$	668,638
	757			Dubai Aerospace, Term Loan B-1		8.933%		7/23/14		BB-			757,941
	573			Dubai Aerospace, Term Loan B-2		8.933%		7/23/13		BB-			573,835
	2,509			Midwestern Aircraft (Spirit Aerosystems Inc.), Term Loan B		6.901%		12/30/11		BBB-			2,489,775
	2,391			Vought Aircraft Industries, Inc., Term Loan		7.340%		12/22/11		Ba2			2,370,095
	545			Vought Aircraft Industries, Inc., Tranche B, Letter of Credit		7.624%		12/22/10		Ba2			540,568
	7,444			Total Aerospace & Defense									7,400,852
				Airlines – 4.2% (2.6% of Total Investments)
	2,000			Delta Air Lines, Inc., Synthetic Letter of Credit, WI/DD		TBD		TBD		Ba2			1,958,000
	1,995			Delta Air Lines, Inc., Term Loan		8.082%		4/30/14		B			1,980,394
	1,980			Northwest Airlines Inc., Term Loan		7.030%		8/01/13		BB			1,909,874
	4,378			United Air Lines Inc., Term Loan B		7.001%		2/01/14		BB-			4,205,312
	10,353			Total Airlines									10,053,580
				Auto Components – 5.8% (3.5% of Total Investments)
	4,224			Federal-Mogul Corporation, Term Loan A, (5)		6.003%		2/24/04		N/R			4,165,522
	5,551			Federal-Mogul Corporation, Term Loan B, (5)		7.253%		2/24/05		N/R			5,470,933
	460			Gen Tek Inc., Term Loan B		7.080%		2/28/11		BB-			451,716
	1,712			Gen Tek Inc., Additional Term Loan B		7.339%		2/28/11		BB-			1,679,793
	2,000			Goodyear Tire & Rubber Company, Second Lien Term Loan		6.430%		4/30/14		Ba1			1,947,917
	1,479			Metalforming Technologies, Inc., Term Loan A, (5) (6)		0.000%		9/30/07		N/R			281,039
	575			Metalforming Technologies, Inc., Term Loan B, (PIK), (5) (6)		0.000%		9/30/07		N/R			109,299
	16,001			Total Auto Components									14,106,219
				Building Products – 6.3% (3.8% of Total Investments)
	879			Atrium Companies Inc., Term Loan		8.529%		5/31/12		BB-			816,017
	2,000			Building Materials Corporation of America, Second Lien Term Loan		10.813%		9/15/14		Caa1			1,683,000
	1,985			Building Materials Corporation of America Term Loan		7.937%		2/22/14		BB			1,812,765
	2,534			Euramax Domestic, Term Loan		8.244%		6/29/12		B+			2,360,800
	1,940			Nortek, Inc., Term Loan B		7.055%		8/27/11		Ba2			1,901,200
	2,435			Stile Acquisition Corporation, Canadian Term Loan		7.115%		4/05/13		BB			2,294,218
	2,440			Stile Acquisition Corporation, U.S. Term Loan		7.115%		4/05/13		BB			2,298,127
	1,980			TFS Acquisition, Term Loan		8.698%		8/11/13		B+			1,950,300
	16,193			Total Building Products									15,116,427
				Capital Markets – 0.6% (0.4% of Total Investments)
	1,534			Ameritrade Holdings Corporation, Term Loan B Facility		6.300%		12/31/12		Ba1			1,518,890
				Chemicals – 3.9% (2.4% of Total Investments)
	1,592			Celanese Holdings, LLC, Term Loan B		6.979%		4/02/14		BB			1,566,794
	400			Celanese Holdings, LLC, Credit Linked Deposits		5.124%		4/02/14		BB			393,667
	2,970			Hexion Specialty Chemicals, Inc., Term Loan C4		7.625%		5/05/13		Ba3			2,945,404
	762			Huntsman International LLC, Term Loan		6.643%		4/19/14		BB+			756,921
	1,995			ISP Chemco Term Loan		7.077%		6/04/14		BB-			1,953,105
	1,950			Rockwood Specialties Group, Inc., Term Loan E		6.460%		7/30/12		BB			1,921,847
	9,669			Total Chemicals									9,537,738
				Commercial Services & Supplies – 2.8% (1.7% of Total Investments)
	2,370			Acco Brands, Term Loan B		7.175%		8/17/12		Ba1			2,337,413
	730			Allied Waste North America, New Term Loan B		6.552%		3/28/14		BBB-			717,725
	393			Allied Waste North America, LC Facility		6.871%		3/28/14		BBB-			386,118
	796			Rental Service Corporation, Second Lien Term Loan		8.750%		11/27/13		B-			777,934
	2,000			Williams Scotsman, Inc., Term Loan B		0.000%		6/28/10		BB+			1,985,000
	677			Workflow Holdings Corporation, Term Loan		9.484%		11/30/11		BB-			589,385
	6,966			Total Commercial Services & Supplies									6,793,575
				Containers & Packaging – 4.5% (2.7% of Total Investments)
	455			Bluegrass Container Company, LLC, Delayed Draw, 1st Lien		7.288%		6/30/13		BB			452,777
	1,515			Bluegrass Container Company, LLC, 2nd Lien		9.753%		12/31/13		B			1,525,568
	485			Bluegrass Container Company, LLC, Delayed Draw, 2nd Lien		9.753%		12/31/13		B			488,182
	1,520			Bluegrass Container Company, LLC, Term Loan B		7.322%		6/30/13		BB			1,513,229
	5,494			Graham Packaging Company, L.P., Term Loan		7.661%		12/13/11		B+			5,398,891
	437			Smurfit-Stone Container Corporation, Deposit-Funded Commitment		7.124%		11/01/10		Ba2			433,171
	375			Smurfit-Stone Container Corporation, Term Loan B		7.428%		11/01/11		Ba2			372,201
	473			Smurfit-Stone Container Corporation, Term Loan C		7.523%		11/01/11		Ba2			469,613
	169			Smurfit-Stone Container Corporation, Term Loan Tranche C-1		7.188%		11/01/11		Ba2			167,972
	10,923			Total Containers & Packaging									10,821,604
				Diversified Consumer Services – 2.5% (1.5% of Total Investments)
	4,000			Thomson Learning Center, Term Loan		7.950%		7/05/14		B+			3,877,778
	2,278			West Corporation, Term Loan		7.273%		10/24/13		BB-			2,238,109
	6,278			Total Diversified Consumer Services									6,115,887
				Diversified Telecommunication Services – 5.9% (3.6% of Total Investments)
	1,990			Crown Castle Operating Company, Term Loan		6.645%		1/26/14		BBB-			1,948,023
	1,955			Intelsat Corporation, Term Loan		7.124%		7/01/13		BB+			1,935,942
	2,000			Intelsat Corporation Unsecured Term Loan		7.859%		2/01/14		B			1,982,500
	997			Intelsat, Ltd., Term Loan B		7.124%		12/03/13		BB+			987,417
	2,267			Level 3 Financing, Inc., Term Loan		7.493%		3/13/14		B+			2,212,991
	5,000			Qwest Corporation, Term Loan B		6.950%		6/30/10		BBB-			5,108,335
	5,000			WCI Capital Corporation, Term Loan B, (5) (6)		0.000%		9/30/07		N/R			70,833
	19,209			Total Diversified Telecommunication Services									14,246,041
				Electric Utilities – 4.2% (2.5% of Total Investments)
	705			Astoria Generating Company, 1st Lien Term Loan		7.210%		2/23/13		BB-			697,035
	556			Calpine Corporation DIP Revolver, (7) (8)		0.250%		3/29/09		N/R			(26,389	)
	4,422			Calpine Corporation Dip Term Loan		7.448%		3/29/09		N/R			4,384,713
	3,000			Texas Competitive Electric Holdings, Term Loan, WI/DD		TBD		TBD		Ba3			3,000,933
	2,000			Texas Competitive Electric Holdings, Term Loan B3, WI/DD		TBD		TBD		Ba3			2,000,000
	10,683			Total Electric Utilities									10,056,292
				Electrical Equipment – 0.6% (0.4% of Total Investments)
	1,496			Sensus Metering Systems Inc., Term Loan B-1		7.261%		12/17/10		BB			1,473,217
	97			Sensus Metering Systems Inc., Term Loan B-2		7.359%		12/17/10		BB			95,716
	1,593			Total Electrical Equipment									1,568,933
				Electronic Equipment & Instruments – 0.8% (0.5% of Total Investments)
	1,975			Sensata Technologies B.V., U.S. Term Loan		6.760%		4/27/13		BB			1,926,507
				Energy Equipment & Services – 1.0% (0.6% of Total Investments)
	2,490			Dresser, Inc., Term Loan		7.989%		5/04/14		B+			2,444,465
				Food Products – 2.3% (1.4% of Total Investments)
	465			Dole Foods Company Inc., Deposit-Funded Commitment		7.290%		4/12/13		BB-			452,487
	1,031			Dole Foods Company Inc., Term Loan B		7.572%		4/12/13		BB-			1,002,825
	3,436			Dole Foods Company Inc., Term Loan C		7.415%		4/12/13		BB-			3,342,749
	862			Michael Foods, Inc., Term Loan B		7.361%		11/21/10		BB-			851,239
	5,794			Total Food Products									5,649,300
				Gas Utilities – 0.8% (0.5% of Total Investments)
	2,000			Energy Transfer Equity LP, Term Loan		7.106%		2/08/12		BBB-			1,970,625
				Health Care Equipment & Supplies – 0.8% (0.5% of Total Investments)
	1,000			Symbion Healthcare Term Loan A		8.210%		8/01/13		Ba3			971,250
	1,000			Symbion Healthcare Term Loan B		8.210%		8/01/14		Ba3			971,250
	2,000			Total Health Care Equipment & Supplies									1,942,500
				Health Care Providers & Services – 9.5% (5.8% of Total Investments)
	3,292			Davita Inc., Term Loan B		6.754%		10/05/12		BB+			3,229,112
	1,985			HCA, Inc. Term Loan		7.448%		11/18/13		BB			1,942,673
	1,990			Health Management Associates, Inc., Term Loan		6.942%		2/28/14		Ba2			1,905,977
	859			HealthSouth Corporation, Term Loan		7.628%		3/10/13		BB-			842,237
	464			IASIS Healthcare, LLC, Delayed Term Loan, (7)		5.960%		3/14/14		Ba2			322,798
	124			IASIS Healthcare, LLC, LC Facility		4.693%		3/14/14		Ba2			118,238
	1,351			IASIS Healthcare, LLC, Term Loan		7.066%		3/14/14		Ba2			1,291,178
	3,920			LifeCare Holdings Inc., Term Loan B		8.200%		8/11/12		B			3,655,394
	2,150			Psychiatric Solutions Inc., Term Loan B		7.007%		12/03/12		BB-			2,112,507
	2,925			Select Medical Corporation, Term Loan		7.477%		2/24/12		Ba2			2,814,094
	4,871			Vanguard Health Holding Company II, LLC, Replacement Term Loan		7.448%		9/23/11		Ba3			4,775,558
	23,931			Total Health Care Providers & Services									23,009,766
				Hotels, Restaurants & Leisure – 12.4% (7.5% of Total Investments)
	4,925			24 Hour Fitness Worldwide, Inc., Term Loan B		7.809%		6/08/12		Ba3			4,851,125
	1,779			Ameristar Casinos, Inc., Term Loan B		7.428%		11/10/12		BB+			1,765,757
	122			CBRL Group, Inc., Term B-2 Delayed Draw		7.431%		4/28/13		BB			119,021
	776			CBRL Group, Inc., Term Loan B-1		6.860%		4/28/13		BB			756,363
	3,910			CCM Merger, Inc., Term Loan B		7.300%		7/13/12		BB-			3,826,943
	1,975			Cedar Fair LP, Term Loan		6.753%		8/30/12		BB			1,939,203
	2,629			Intrawest Corporation, Term Loan		8.130%		4/24/08		N/R			2,609,385
	353			Isle of Capri Casinos, Inc., Delayed Draw Term Loan A, (7) (8)		0.375%		7/26/14		BB+			(12,309	)
	1,174			Isle of Capri Casinos, Inc., Term Loan		6.741%		7/26/14		BB+			1,132,602
	469			Isle of Capri Casinos, Inc., Delayed Draw Term Loan B		6.643%		7/26/14		BB+			453,041
	71			OSI Restaurant Partners, LLC, Revolver		5.523%		6/14/13		BB-			68,749
	927			OSI Restaurant Partners, LLC, Term Loan		7.063%		6/14/14		BB-			895,008
	3,920			Penn National Gaming, Inc., Term Loan B		6.901%		10/03/12		BBB-			3,900,128
	1,000			Quiznos Sub, Second Lien Term Loan C		10.948%		11/05/13		N/R			962,000
	130			Seminole Gaming, Term Loan B-1 Delayed Draw		6.972%		3/05/14		BBB			128,664
	437			Seminole Gaming, Term Loan B-2 Delayed Draw		7.125%		3/05/14		BBB			434,241
	433			Seminole Gaming, Term Loan B-3 Delayed Draw		6.750%		3/05/14		BBB			430,220
	1,334			Travelport, Term Loan		7.448%		8/23/13		BB-			1,309,812
	268			Travelport, LC Facility		7.448%		8/23/13		BB-			262,815
	998			Travelport, Delayed Term Loan		7.448%		8/23/13		BB-			979,265
	800			Venetian Casino Resort, LLC (Las Vegas Sands, Inc) Delayed Term Loan, (7) (8)		0.750%		5/23/14		BB			(22,039	)
	3,192			Venetian Casino Resort, LLC, Term Loan		6.950%		5/23/14		BB			3,104,065
	31,622			Total Hotels, Restaurants & Leisure									29,894,059
				Household Durables – 2.0% (1.2% of Total Investments)
	4,455			Shea Homes Inc., Term Loan		7.200%		10/27/11		N/R			3,820,163
	1,001			William Carter Company, Term Loan B		6.313%		7/14/12		BBB-			985,871
	5,456			Total Household Durables									4,806,034
				Household Products – 1.9% (1.1% of Total Investments)
	1,753			Prestige Brands, Inc., Term Loan B		7.731%		4/06/11		BB-			1,743,983
	2,774			Solo Cup Company, Term Loan		8.669%		2/27/11		B1			2,772,793
	4,527			Total Household Products									4,516,776
				Independent Power Producers & Energy Traders – 1.7% (1.1% of Total Investments)
	668			Covanta Energy Corporation, Term Loan B		6.876%		2/09/14		BB			650,499
	329			Covanta Energy Corporation, Synthetic Letter of Credit		6.729%		2/09/14		BB			320,404
	800			NRG Energy Inc., Holdco Term Loan, (7) (8)		0.500%		2/01/13		BB			(15,571	)
	2,322			NRG Energy Inc., Term Loan		6.948%		2/01/13		Ba1			2,277,110
	966			NRG Energy Inc., Credit Linked Deposits		6.848%		2/01/13		Ba1			947,716
	5,085			Total Independent Power Producers & Energy Traders									4,180,158
				Insurance – 2.4% (1.4% of Total Investments)
	5,933			Conseco, Inc., Term Loan		6.819%		10/10/13		Ba3			5,683,040
				Internet Software & Services – 1.2% (0.7% of Total Investments)
	2,977			Riverdeep Interactive Learning USA, Inc., Term Loan		7.948%		12/20/13		B1			2,965,042
				IT Services – 3.3% (2.0% of Total Investments)
	3,000			First Data Term Loan, Tranche B		7.960%		9/24/14		BB-			2,892,614
	5,106			SunGard Data Systems Inc., Term Loan B		7.356%		2/28/14		BB+			5,047,669
	8,106			Total IT Services									7,940,283
				Leisure Equipment & Products – 1.1% (0.7% of Total Investments)
	2,734			Bombardier Recreational Products Inc., Term Loan		7.699%		6/28/13		B+			2,662,405
				Machinery – 4.4% (2.6% of Total Investments)
	1,995			Maxim Crane Works L.P., Term Loan		6.799%		6/29/14		BB-			1,895,250
	3,178			Navistar International Corporation, Term Loan		8.234%		1/19/12		BB-			3,129,714
	1,156			Navistar International Corporation, Synthetic Letter of Credit		6.853%		1/19/12		BB-			1,138,078
	1,975			Oshkosh Truck Corporation, Term Loan		7.450%		12/06/13		BBB-			1,946,300
	557			Rexnord Corporation, Incremental Term Loan B-2		7.642%		7/19/13		Ba2			554,611
	1,869			Rexnord Corporation, Term Loan B		7.603%		7/19/13		Ba2			1,860,676
	10,730			Total Machinery									10,524,629
				Media – 21.6% (13.1% of Total Investments)
	4,500			American Media Operations, Inc., Term Loan		8.800%		1/13/13		B1			4,449,375
	1,955			Cablevision Systems Corporation, Incremental Term Loan		6.875%		3/29/13		BB			1,912,952
	1,975			Carmike Cinemas Inc., Delayed Draw Term Loan		9.230%		5/19/12		B1			1,971,708
	1,990			Cequel Communications LLC., Term Loan B		7.268%		11/05/13		BB-			1,931,295
	1,000			Charter Communications Operating, LLC, Holdco Term Loan		7.698%		3/06/14		B1			961,719
	1,300			Charter Communications Operating, LLC, Term Loan		6.990%		3/06/14		B+			1,251,466
	2,993			Discovery Communications Holdings, Term Loan		7.198%		5/14/14		N/R			2,960,081
	2,978			Idearc Inc., Term Loan		7.200%		11/17/14		BBB-			2,940,126
	2,948			Metro-Goldwyn-Mayer Studios, Inc., Term Loan B		8.448%		4/08/12		N/R			2,833,363
	4,950			Nielsen Finance LLC, Term Loan B		7.360%		8/09/13		Ba3			4,826,945
	1,903			Philadelphia Newspapers, Term Loan		8.750%		6/29/13		N/R			1,750,442
	2,573			Regal Cinemas Corporation, Term Loan		6.698%		10/27/13		Ba2			2,519,815
	1,867			Tribune Company, Term Loan X		7.744%		6/04/09		BB			1,847,854
	6,983			Tribune Company, Term Loan B		8.244%		6/04/14		BB			6,500,708
	483			Univision Communications, Delayed Term Loan, (7) (8)		3.668%		9/29/14		B+			(13,591	)
	2,000			Univision Communications, Second Lien Term Loan		7.253%		3/29/09		B3			1,987,500
	7,732			Univision Communications, Term Loan		7.210%		9/29/14		Ba3			7,340,134
	427			Valassis Communications, Inc., Delayed Draw Term, (7) (8)		1.000%		3/02/14		BB			(20,000	)
	1,432			Valassis Communications, Inc., Tranche B Term Loan		6.950%		3/02/14		BB			1,365,002
	2,883			WMG Acquisition Corp., Term Loan		7.419%		2/28/11		Ba2			2,821,577
	54,872			Total Media									52,138,471
				Metals & Mining – 4.1% (2.5% of Total Investments)
	1,985			Aleris International Inc., Term Loan		7.063%		12/19/11		BB-			1,896,502
	1,867			Amsted Industries Incorporated, Delayed Draw Term Loan		7.266%		4/08/13		BB			1,826,956
	2,568			Amsted Industries Incorporated, Term Loan B		7.279%		4/08/13		BB			2,527,917
	1,995			Edgen Murray II, L.P., Term Loan		8.115%		5/11/14		B			1,957,594
	1,841			John Maneely Company, Term Loan		8.638%		12/08/11		B+			1,721,364
	10,256			Total Metals & Mining									9,930,333
				Oil, Gas & Consumable Fuels – 2.8% (1.7% of Total Investments)
	550			Big West Oil, LLC, Delayed Draw Term Loan, (7) (8)		1.500%		5/15/14		BB			(16,500	)
	448			Big West Oil, LLC, Term Loan		7.448%		5/15/14		BB			434,075
	301			Coffeyville Resources LLC, Letter of Credit		8.481%		12/28/10		B-			298,813
	980			Coffeyville Resources LLC., Term Loan D		8.481%		12/28/13		B-			974,533
	1,000			El Paso Corporation, Letter of Credit		6.438%		7/31/11		Ba1			988,125
	774			Targa Resources Inc., Synthetic Letter of Credit		7.323%		10/31/12		Ba3			768,581
	1,388			Targa Resources Inc., Term Loan B		7.525%		10/31/12		Ba3			1,377,809
	2,000			Venoco Inc, Term Loan		9.125%		9/20/11		B			1,990,000
	7,441			Total Oil, Gas & Consumable Fuels									6,815,436
				Paper & Forest Products – 3.0% (1.8% of Total Investments)
	3,930			Georgia-Pacific Corporation, Term Loan B		7.383%		12/20/12		BB+			3,843,330
	1,547			Georgia-Pacific Corporation, Term Loan B-2		7.372%		12/20/12		BB+			1,512,614
	1,995			NewPage Corporation, Term Loan B		7.469%		5/02/11		Ba2			1,979,936
	7,472			Total Paper & Forest Products									7,335,880
				Pharmaceuticals – 0.8% (0.5% of Total Investments)
	860			Stiefel Laboratories Inc, Delayed Draw Term Loan		7.499%		12/28/13		BB-			844,143
	1,125			Stiefel Laboratories Inc, Term Loan		7.499%		12/28/13		BB-			1,103,638
	1,985			Total Pharmaceuticals									1,947,781
				Real Estate Investment Trust – 1.5% (0.9% of Total Investments)
	3,970			Landsource Community Development LLC, Term Loan		8.249%		2/27/13		N/R			3,537,552
				Real Estate Management & Development – 4.5% (2.7% of Total Investments)
	3,721			Capital Automotive LP., Term Loan		6.880%		12/15/10		BB+			3,682,150
	3,500			LNR Property Corporation, Term Loan B		8.110%		7/12/11		BB			3,421,250
	4,000			Realogy Corporation, Term Loan, WI/DD		TBD		TBD		BB			3,728,000
	11,221			Total Real Estate Management & Development									10,831,400
				Road & Rail – 3.2% (2.0% of Total Investments)
	8,837			Swift Transportation, Term Loan		8.375%		5/10/14		BB-			7,809,884
				Semiconductors & Equipment – 0.8% (0.5% of Total Investments)
	1,985			Freescale Semiconductor, Term Loan		7.330%		11/29/13		Baa3			1,909,703
				Software – 1.1% (0.7% of Total Investments)
	2,805			Dealer Computer Services, Term Loan		7.198%		10/26/12		BB			2,744,583
				Specialty Retail – 9.0% (5.5% of Total Investments)
	752			Blockbuster, Inc., Term Loan A		9.374%		8/20/09		B			747,791
	1,246			Blockbuster, Inc., Term Loan B		9.623%		8/20/11		B			1,241,254
	970			Burlington Coat Factory Warehouse Corporation, Term Loan		7.760%		5/28/11		B2			912,138
	990			CSK Automotive Corporation, Term Loan		9.000%		7/29/10		Ba3			987,562
	3,887			Michaels Stores Inc., Term Loan		7.619%		10/31/13		B			3,732,709
	1,122			Micro Warehouse, Inc., Term Loan B, (5) (6) (9)		0.000%		1/30/07		N/R			165,826
	3,914			Norwood Promotional Products, Term Loan A		11.875%		8/17/09		N/R			3,915,194
	5,992			Norwood Promotional Products, Term Loan B		6.000%		8/17/11		N/R			5,169,031
	990			Sally Holdings LLC, Term Loan		8.006%		11/16/13		BB-			972,675
	4,000			TRU 2005 RE Holding CO I, LLC, Term Loan		8.129%		12/08/08		B3			3,963,334
	23,863			Total Specialty Retail									21,807,514
				Textiles, Apparel & Luxury Goods – 0.8% (0.5% of Total Investments)
	2,001			Visant Holding Corporation, Term Loan C		7.198%		7/29/10		Ba1			1,987,107
				Trading Companies & Distributors – 1.6% (1.0% of Total Investments)
	1,980			Ashtead Group Public Limited Company, Term Loan		7.125%		8/31/11		BB+			1,945,351
	393			Brenntag Holdings, Acquisition Facility		7.387%		1/20/14		B+			384,955
	1,606			Brenntag Holdings, Term Loan B2		7.387%		1/20/14		B+			1,575,463
	3,979			Total Trading Companies & Distributors									3,905,769
				Wireless Telecommunication Services – 1.6% (1.0% of Total Investments)
	4,000			Asurion Corporation, Term Loan		8.360%		7/03/14		N/R			3,918,750
$	376,893			Total Variable Rate Senior Loan Interests (cost $370,538,270)									354,071,790
Principal
Amount (000)				Description (1)		Coupon		Maturity		Ratings (3)		Value
				Corporate Bonds – 8.3% (5.0% of Total Investments)
				Hotels, Restaurants & Leisure – 1.0% (0.6% of Total Investments)
$	2,400			Park Place Entertainment		8.875%		9/15/08		Ba1		$	2,439,000
				Media – 0.9% (0.5% of Total Investments)
	2,000			Cablevision Systems Corporation, Floating Rate Note, 4.500% plus six-month LIBOR, 144A		9.306%		4/01/09		B+			2,065,000
				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		8.644%		8/01/14		B+			2,020,000
				Semiconductors & Equipment – 2.2% (1.3% of Total Investments)
	500			Avago Technologies Finance Pte. Ltd., Floating Rate Note, 5.500% plus three-month LIBOR		10.394%		6/01/13		B			512,500
	5,000			NXP BV, Floating Rate Note, 2.750% plus three-month LIBOR		7.644%		10/15/13		BB			4,756,250
	5,500			Total Semiconductors & Equipment									5,268,750
				Textiles, Apparel & Luxury Goods – 0.9% (0.6% of Total Investments)
	2,000			HanesBrands Inc., Floating Rate Note, 3.375% plus six-month LIBOR		8.181%		12/15/14		B2			2,020,000
				Wireless Telecommunication Services – 2.5% (1.5% of Total Investments)
	6,000			Dobson Communications Corporation, Floating Rate Note, 4.250% plus three-month LIBOR		9.144%		10/15/12		Caa1			6,150,000
$	19,900			Total Corporate Bonds (cost $19,800,173)									19,962,750
Shares				Description (1)								Value
				Common Stocks – 0.6% (0.4% of Total Investments)
				Auto Components – 0.0% (0.0% of Total Investments)
	511			Gen Tek Inc., (6)								$	17,374
	279,642			Metalforming Technologies Inc., (5) (6) (9)									–
				Total Auto Components									17,374
				Building Products – 0.6% (0.4% of Total Investments)
	35,644			Armstrong World Industries Inc., (6)									1,461,760
				Total Common Stocks (cost $1,393,369)									1,479,134
Shares				Description (1)								Value
				Warrants – 0.1% (0.0% of Total Investments)
	545			Gen Tek Inc., Warrant Class B								$	25,986
	268			Gen Tek Inc., Warrant Class C									13,534
	5,672			Reliant Energy Inc., Warrant Class A									120,246
				Total Warrants (cost $40,254)									159,766
Principal
Amount (000)				Description (1)		Coupon		Maturity				Value
				Short-Term Investments – 9.1% (5.5% of Total Investments)
$	21,969			Repurchase Agreement with Fixed Income Clearing Corporation, dated 10/31/07, repurchase price $21,971,167, collateralized by $21,880,000 U.S. Treasury Notes, 4.875%, due 5/31/07, value $22,414,791		4.300%		11/01/07				$	21,968,543
				Total Short-Term Investments (cost $21,968,543)									21,968,543
				Total Investments (cost $413,740,609) – 164.5%									397,641,983
				Borrowings Payable – (42.6)% (10)									(103,000,000	)
				Other Assets Less Liabilities – (2.9)%									(6,947,744	)
				Preferred Shares, at Liquidation Value – (19.0)%									(46,000,000	)
				Net Assets Applicable to Common Shares – 100%								$	241,694,239

(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 in which the Fund invests 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, 2007, 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, 2007. At October 31, 2007, the Fund had unfunded Senior Loan commitments of $3,874,216.
(8)		Negative value represents unrealized depreciation on Senior Loan commitment at October 31, 2007.
(9)		Investment valued at fair value using methods determined in good faith by, or at the discretion of, the Board of Trustees.
(10)		Borrowings Payable as a percentage of total investments is (25.9)%.
N/R		Not rated.
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.
PIK		In lieu of cash payment, interest accrued on “Payment in Kind” investment increases principal outstanding.
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.
WI/DD		Purchased on a when-issued or delayed delivery basis.

The following information is presented on an income tax basis. Differences between amounts for financial statement and federal income tax purposes are primarily due to the treatment of paydown gains and losses and timing differences in recognizing certain gains and losses on investment transactions.

At October 31, 2007, the cost of investments was $413,764,805.

Gross unrealized appreciation and gross unrealized depreciation of investments at October 31, 2007, were as follows:

Gross unrealized:
Appreciation		$	2,181,649
Depreciation			(18,304,471	)
Net unrealized appreciation (depreciation) of investments		$	(16,122,822	)

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 28, 2007

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 28, 2007

Date December 28, 2007