- Quarterly Schedule of Portfolio Holdings of Registered Management Investment Company (N-Q)

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 811-6623

Nuveen California Select Tax-Free Income Portfolio

(Exact name of registrant as specified in charter)

Nuveen Investments

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: 3/31

Date of reporting period: 12/31/10

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


	Portfolio of Investments (Unaudited)
	Nuveen California Select Tax-Free Income Portfolio (NXC)
	December 31, 2010
Principal		Optional Call
Amount (000)	Description (1)	Provisions (2)	Ratings (3)	Value
	Consumer Staples – 4.1%
$ 155	California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Bonds, Sonoma	6/15 at 100.00	BBB	$ 142,867
	County Tobacco Securitization Corporation, Series 2005, 4.250%, 6/01/21
1,080	California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Revenue	6/12 at 100.00	BBB	1,078,985
	Bonds, Fresno County Tobacco Funding Corporation, Series 2002, 5.625%, 6/01/23
4,045	Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed	6/22 at 100.00	Baa3	2,278,427
	Bonds, Series 2007A-2, 0.000%, 6/01/37
5,280	Total Consumer Staples			3,500,279
	Education and Civic Organizations – 9.6%
3,000	California Educational Facilities Authority, Revenue Bonds, Santa Clara University, Series	4/18 at 100.00	Aa3	3,095,130
	2008A, 5.625%, 4/01/37
45	California Educational Facilities Authority, Revenue Bonds, University of Redlands, Series	10/15 at 100.00	A3	39,363
	2005A, 5.000%, 10/01/35
1,000	California Educational Facilities Authority, Revenue Bonds, University of San Diego, Series	10/12 at 100.00	A2	1,005,700
	2002A, 5.500%, 10/01/32
	California Educational Facilities Authority, Revenue Bonds, University of the Pacific,
	Series 2006:
35	5.000%, 11/01/21	11/15 at 100.00	A2	35,989
45	5.000%, 11/01/25	11/15 at 100.00	A2	45,246
3,000	California Infrastructure Economic Development Bank, Revenue Bonds, J. David Gladstone	10/11 at 101.00	A–	3,066,330
	Institutes, Series 2001, 5.500%, 10/01/19
1,000	Long Beach Bond Financing Authority, California, Lease Revenue Refunding Bonds, Long Beach	11/11 at 101.00	BBB	870,410
	Aquarium of the South Pacific, Series 2001, 5.250%, 11/01/30 – AMBAC Insured
8,125	Total Education and Civic Organizations			8,158,168
	Health Care – 13.4%
110	California Health Facilities Financing Authority, Revenue Bonds, Kaiser Permanante System,	4/16 at 100.00	A+	99,295
	Series 2006, 5.000%, 4/01/37
2,550	California Health Facilities Financing Authority, Revenue Bonds, Sutter Health, Series 2007A,	11/16 at 100.00	AA–	2,306,577
	5.250%, 11/15/46 (UB)
2,000	California Infrastructure Economic Development Bank, Revenue Bonds, Kaiser Hospital Assistance	8/11 at 102.00	A+	1,995,040
	LLC, Series 2001A, 5.550%, 8/01/31
1,500	California Statewide Community Development Authority, Hospital Revenue Bonds, Monterey	6/13 at 100.00	AA+	1,600,455
	Peninsula Hospital, Series 2003B, 5.250%, 6/01/18 – AGM Insured
1,500	California Statewide Community Development Authority, Insured Mortgage Hospital Revenue Bonds,	5/11 at 102.00	A–	1,450,230
	Mission Community Hospital, Series 2001, 5.375%, 11/01/26
545	California Statewide Community Development Authority, Revenue Bonds, Kaiser Permanente System,	8/16 at 100.00	A+	523,767
	Series 2001C, 5.250%, 8/01/31
1,880	California Statewide Community Development Authority, Revenue Bonds, Los Angeles Orthopaedic	6/11 at 100.00	BBB+	1,881,109
	Hospital Foundation, Series 2000, 5.500%, 6/01/17 – AMBAC Insured
540	Loma Linda, California, Hospital Revenue Bonds, Loma Linda University Medical Center, Series	12/17 at 100.00	BBB	590,360
	2008A, 8.250%, 12/01/38
1,100	Palomar Pomerado Health Care District, California, Certificates of Participation, Series 2010,	11/20 at 100.00	Baa3	986,931
	6.000%, 11/01/41
11,725	Total Health Care			11,433,764
	Housing/Multifamily – 1.3%
380	California Municipal Finance Authority, Mobile Home Park Revenue Bonds, Caritas Projects	8/20 at 100.00	BBB–	354,962
	Series 2010A, 6.400%, 8/15/45
750	California Statewide Community Development Authority, Student Housing Revenue Bonds, EAH –	8/12 at 100.00	Baa1	735,503
	Irvine East Campus Apartments, LLC Project, Series 2002A, 5.500%, 8/01/22 – ACA Insured
1,130	Total Housing/Multifamily			1,090,465
	Housing/Single Family – 0.1%
95	California Housing Finance Agency, Home Mortgage Revenue Bonds, Series 2006H, 5.750%,	2/16 at 100.00	A	96,595
	8/01/30 – FGIC Insured (Alternative Minimum Tax)
	Industrials – 1.8%
1,015	California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Republic	No Opt. Call	BBB	1,033,554
	Services Inc., Series 2002C, 5.250%, 6/01/23 (Mandatory put 12/01/17) (Alternative Minimum Tax)
500	California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Waste	1/16 at 102.00	BBB	487,615
	Management Inc., Series 2002A, 5.000%, 1/01/22 (Alternative Minimum Tax)
1,515	Total Industrials			1,521,169
	Long-Term Care – 2.8%
1,500	ABAG Finance Authority for Non-Profit Corporations, California, Insured Senior Living Revenue	11/12 at 100.00	A–	1,487,985
	Bonds, Odd Fellows Home of California, Series 2003A, 5.200%, 11/15/22
1,000	California Statewide Communities Development Authority, Revenue Bonds, Inland Regional Center	12/17 at 100.00	Baa1	895,470
	Project, Series 2007, 5.250%, 12/01/27
2,500	Total Long-Term Care			2,383,455
	Tax Obligation/General – 24.2%
750	California State, General Obligation Bonds, Series 2004, 5.000%, 2/01/23	2/14 at 100.00	A1	751,305
1,650	California State, General Obligation Bonds, Various Purpose Series 2009, 5.500%, 11/01/39	11/19 at 100.00	A1	1,602,282
1,000	Fremont Unified School District, Alameda County, California, General Obligation Bonds, Series	8/12 at 101.00	Aa2	1,033,650
	2002A, 5.000%, 8/01/21 – FGIC Insured
	Golden West Schools Financing Authority, California, General Obligation Revenue Refunding
	Bonds, School District Program, Series 1999A:
4,650	0.000%, 8/01/16 – NPFG Insured	No Opt. Call	Baa1	3,585,476
1,750	0.000%, 2/01/17 – NPFG Insured	No Opt. Call	Baa1	1,292,725
2,375	0.000%, 8/01/17 – NPFG Insured	No Opt. Call	Baa1	1,697,603
2,345	0.000%, 2/01/18 – NPFG Insured	No Opt. Call	Baa1	1,590,473
	Mountain View-Los Altos Union High School District, Santa Clara County, California, General
	Obligation Capital Appreciation Bonds, Series 1997C:
1,015	0.000%, 5/01/17 – NPFG Insured	No Opt. Call	Aa1	784,839
1,080	0.000%, 5/01/18 – NPFG Insured	No Opt. Call	Aa1	772,826
100	Roseville Joint Union High School District, Placer County, California, General Obligation	8/15 at 100.00	AA–	100,300
	Bonds, Series 2006B, 5.000%, 8/01/27 – FGIC Insured
3,220	Sacramento City Unified School District, Sacramento County, California, General Obligation	7/15 at 100.00	Aa2	3,225,796
	Bonds, Series 2005, 5.000%, 7/01/27 – NPFG Insured
1,500	San Diego Unified School District, San Diego County, California, General Obligation Bonds,	7/13 at 101.00	AA+	1,662,360
	Series 2003E, 5.250%, 7/01/24 – AGM Insured
2,565	Sunnyvale School District, Santa Clara County, California, General Obligation Bonds, Series	9/15 at 100.00	AA+	2,604,270
	2005A, 5.000%, 9/01/26 – AGM Insured
24,000	Total Tax Obligation/General			20,703,905
	Tax Obligation/Limited – 18.8%
1,000	Bell Community Redevelopment Agency, California, Tax Allocation Bonds, Bell Project Area,	10/13 at 100.00	N/R	809,200
	Series 2003, 5.625%, 10/01/33 – RAAI Insured
3,500	California State Public Works Board, Lease Revenue Bonds, Department of Corrections,	No Opt. Call	A2	3,886,712
	Calipatria State Prison, Series 1991A, 6.500%, 9/01/17 – NPFG Insured
1,000	California State Public Works Board, Lease Revenue Bonds, Department of Mental Health,	6/14 at 100.00	A2	1,003,120
	Coalinga State Hospital, Series 2004A, 5.500%, 6/01/23
1,500	California State Public Works Board, Lease Revenue Bonds, Various Capital Projects, Series	11/19 at 100.00	A2	1,544,190
	2009I-1, 6.375%, 11/01/34
120	Capistrano Unified School District, Orange County, California, Special Tax Bonds, Community	9/15 at 100.00	BBB	112,361
	Facilities District, Series 2005, 5.000%, 9/01/24 – FGIC Insured
360	Chino Redevelopment Agency, California, Merged Chino Redevelopment Project Area Tax Allocation	9/16 at 101.00	A–	294,800
	Bonds, Series 2006, 5.000%, 9/01/38 – AMBAC Insured
1,000	Fontana Public Financing Authority, California, Tax Allocation Revenue Bonds, North Fontana	10/15 at 100.00	A	875,140
	Redevelopment Project, Series 2005A, 5.000%, 10/01/32 – AMBAC Insured
	Irvine, California, Unified School District, Community Facilities District Special Tax Bonds,
	Series 2006A:
55	5.000%, 9/01/26	9/16 at 100.00	N/R	48,591
130	5.125%, 9/01/36	9/16 at 100.00	N/R	109,806
215	Los Angeles Community Redevelopment Agency, California, Lease Revenue Bonds, Manchester Social	9/15 at 100.00	A1	176,833
	Services Project, Series 2005, 5.000%, 9/01/37 – AMBAC Insured
1,300	Orange County, California, Special Tax Bonds, Community Facilities District 03-1 of Ladera	8/12 at 101.00	N/R	1,178,749
	Ranch, Series 2004A, 5.625%, 8/15/34
105	Rialto Redevelopment Agency, California, Tax Allocation Bonds, Merged Project Area, Series	9/15 at 100.00	A–	87,161
	2005A, 5.000%, 9/01/35 – SYNCORA GTY Insured
130	Roseville, California, Certificates of Participation, Public Facilities, Series 2003A, 5.000%,	8/13 at 100.00	AA–	124,349
	8/01/25 – AMBAC Insured
605	Sacramento City Financing Authority, California, Lease Revenue Refunding Bonds, Series 1993A,	No Opt. Call	A1	639,757
	5.400%, 11/01/20 – NPFG Insured
3,000	San Mateo County Transit District, California, Sales Tax Revenue Bonds, Series 2005A, 5.000%,	6/15 at 100.00	AA	3,116,310
	6/01/21 – NPFG Insured
225	San Mateo Union High School District, San Mateo County, California, Certificates of	12/17 at 100.00	AA–	199,618
	Participation, Phase 1, Series 2007A, 5.000%, 12/15/30 – AMBAC Insured
1,000	Santa Clara County Board of Education, California, Certificates of Participation, Series 2002,	4/12 at 101.00	Baa1	994,890
	5.000%, 4/01/25 – NPFG Insured
1,000	Travis Unified School District, Solano County, California, Certificates of Participation,	9/16 at 100.00	N/R	877,540
	Series 2006, 5.000%, 9/01/26 – FGIC Insured
16,245	Total Tax Obligation/Limited			16,079,127
	Transportation – 5.7%
1,150	Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Bonds, Series	1/11 at 100.00	BBB–	939,389
	1995A, 5.000%, 1/01/35
3,500	Los Angeles Harbors Department, California, Revenue Refunding Bonds, Series 2001B, 5.500%,	8/11 at 100.00	AA	3,571,190
	8/01/17 – AMBAC Insured (Alternative Minimum Tax)
445	San Francisco Airports Commission, California, Revenue Bonds, San Francisco International	5/11 at 100.00	A1	395,472
	Airport, Second Series 1999, Issue 23A, 5.000%, 5/01/30 – FGIC Insured (Alternative
	Minimum Tax)
5,095	Total Transportation			4,906,051
	U.S. Guaranteed – 11.0% (4)
400	Beverly Hills Unified School District, Los Angeles County, California, General Obligation	8/12 at 100.00	Aa1 (4)	427,612
	Bonds, Series 2002A, 5.000%, 8/01/26 (Pre-refunded 8/01/12)
	California Department of Water Resources, Power Supply Revenue Bonds, Series 2002A:
1,750	5.750%, 5/01/17 (Pre-refunded 5/01/12)	5/12 at 101.00	Aaa	1,883,473
2,000	5.125%, 5/01/19 (Pre-refunded 5/01/12)	5/12 at 101.00	Aaa	2,135,980
800	California Educational Facilities Authority, Revenue Bonds, University of the Pacific, Series	11/11 at 100.00	A2 (4)	831,816
	2002, 5.250%, 11/01/21 (Pre-refunded 11/01/11)
800	California State, General Obligation Bonds, Series 2004, 5.125%, 2/01/27 (Pre-refunded 2/01/14)	2/14 at 100.00	AAA	896,056
2,000	North Orange County Community College District, California, General Obligation Bonds, Series	8/12 at 101.00	AA (4)	2,148,260
	2002A, 5.000%, 8/01/22 (Pre-refunded 8/01/12) – NPFG Insured
1,000	Port of Oakland, California, Revenue Bonds, Series 2002M, 5.250%, 11/01/20 (Pre-refunded	11/12 at 100.00	A (4)	1,083,020
	11/01/12) – FGIC Insured
8,750	Total U.S. Guaranteed			9,406,217
	Utilities – 5.4%
645	Long Beach Bond Finance Authority, California, Natural Gas Purchase Revenue Bonds, Series	No Opt. Call	A	607,080
	2007A, 5.500%, 11/15/37
200	Los Angeles Department of Water and Power, California, Power System Revenue Bonds, Series	7/13 at 100.00	AA–	208,442
	2003A-2, 5.000%, 7/01/21 – NPFG Insured
7,600	Merced Irrigation District, California, Certificates of Participation, Water and Hydroelectric	9/16 at 64.56	A	3,347,116
	Series 2008B, 0.000%, 9/01/23
215	Merced Irrigation District, California, Electric System Revenue Bonds, Series 2005, 5.125%,	9/15 at 100.00	N/R	178,641
	9/01/31 – SYNCORA GTY Insured
275	Turlock Irrigation District, California, Revenue Refunding Bonds, Series 1992A, 6.250%,	No Opt. Call	A1	280,280
	1/01/12 – NPFG Insured
8,935	Total Utilities			4,621,559
	Water and Sewer – 2.5%
150	Healdsburg Public Financing Authority, California, Wastewater Revenue Bonds, Series 2006,	4/16 at 100.00	AA–	140,010
	5.000%, 4/01/36 – NPFG Insured
250	Sacramento County Sanitation District Financing Authority, California, Revenue Bonds, Series	6/16 at 100.00	AA	250,283
	2006, 5.000%, 12/01/31 – FGIC Insured
825	South Feather Water and Power Agency, California, Water Revenue Certificates of Participation,	4/13 at 100.00	A	806,817
	Solar Photovoltaic Project, Series 2003, 5.375%, 4/01/24
1,000	Woodbridge Irrigation District, California, Certificates of Participation, Water Systems	7/13 at 100.00	A+	925,240
	Project, Series 2003, 5.625%, 7/01/43
2,225	Total Water and Sewer			2,122,350
$ 95,620	Total Investments (cost $87,452,530) – 100.7%			86,023,104
	Floating Rate Obligation – (1.8)%			(1,540,000)
	Other Assets Less Liabilities – 1.1%			953,767
	Net Assets – 100%			$ 85,436,871

Fair Value Measurements

In determining the fair 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 methodologies 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 December 31, 2010:


	Level 1	Level 2	Level 3	Total
Investments:
Municipal Bonds	$ —	$86,023,104	$ —	$86,023,104

During the period ended December 31, 2010, the Fund recognized no significant transfers to/from Level 1, Level 2, or Level 3.

Income Tax Information

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 timing differences in recognizing taxable market discount, timing differences in recognizing certain gains and losses on investment transactions and the treatment of investments in inverse floating rate securities reflected as financing transactions, if any. 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 December 31, 2010, the cost of investments was $85,906,268.

Gross unrealized appreciation and gross unrealized depreciation of investments at December 31, 2010, were as follows:


Gross unrealized:
Appreciation	$ 1,973,336
Depreciation	(3,400,051)
Net unrealized appreciation (depreciation) of investments	$(1,426,715)


(1)		All percentages shown in the Portfolio of Investments are based on net assets.
(2)		Optional Call Provisions: Dates (month and year) and prices of the earliest optional call or redemption.
		There may be other call provisions at varying prices at later dates. Certain mortgage-backed securities
		may be subject to periodic principal paydowns.
(3)		Ratings: Using the highest of Standard & Poor’s Group (“Standard & Poor’s”), Moody’s Investor Service,
		Inc. (“Moody’s”) or Fitch, Inc. (“Fitch”) rating. Ratings below BBB by Standard & Poor’s, Baa by Moody’s or
		BBB by Fitch are considered to be below investment grade. Holdings designated N/R are not rated by any
		of these national rating agencies.
(4)		Backed by an escrow or trust containing sufficient U.S. Government or U.S. Government agency securities,
		which ensure the timely payment of principal and interest. Such investments are normally considered to
		be equivalent to AAA rated securities.
N/R		Not rated.
(UB)		Underlying bond of an inverse floating rate trust reflected as a financing transaction.

Item 2. Controls and Procedures.

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)).

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: See 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 California Select Tax-Free Income Portfolio

By (Signature and Title) /s/ Kevin J. McCarthy

Kevin J. McCarthy

Vice President and Secretary

Date March 1, 2011

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.

By (Signature and Title) /s/ Gifford R. Zimmerman

Gifford R. Zimmerman

Chief Administrative Officer (principal executive officer)

Date March 1, 2011

By (Signature and Title) /s/ Stephen D. Foy

Stephen D. Foy

Vice President and Controller (principal financial officer)

Date March 1, 2011

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