NUVEEN CALIFORNIA SELECT TAX FREE INCOME PORTFOLIO

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 811-06623

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: 6/30/14

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)
June 30, 2014

Principal Amount (000)	Description (1)	Optional Call Provisions (2)	Ratings (3)	Value
	LONG-TERM INVESTMENTS – 96.8%
	MUNICIPAL BONDS – 96.8%
	Consumer Staples – 3.8%
$ 85	California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Bonds, Sonoma	6/15 at 100.00	BB+	$ 81,258
	County Tobacco Securitization Corporation, Series 2005, 4.250%, 6/01/21
250	California County Tobacco Securitization Agency, Tobacco Settlement Asset-Backed Revenue	9/14 at 100.00	A1	250,655
	Bonds, Fresno County Tobacco Funding Corporation, Series 2002, 5.625%, 6/01/23
1,450	Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed	6/17 at 100.00	B	1,174,413
	Bonds, Series 2007A-1, 5.000%, 6/01/33
1,095	Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed	6/22 at 100.00	B	878,661
	Bonds, Series 2007A-2, 5.300%, 6/01/37
1,500	Tobacco Securitization Authority of Northern California, Tobacco Settlement Asset-Backed	6/15 at 100.00	B–	1,219,980
	Bonds, Series 2005A-1, 5.500%, 6/01/45
4,380	Total Consumer Staples			3,604,967
	Education and Civic Organizations – 4.1%
3,000	California Educational Facilities Authority, Revenue Bonds, Santa Clara University, Series	4/18 at 100.00	Aa3	3,379,649
	2008A, 5.625%, 4/01/37
45	California Educational Facilities Authority, Revenue Bonds, University of Redlands, Series	10/15 at 100.00	A3	45,710
	2005A, 5.000%, 10/01/35
35	California Educational Facilities Authority, Revenue Bonds, University of the Pacific, Series	11/15 at 100.00	A2	36,952
	2006, 5.000%, 11/01/21
160	California Municipal Finance Authority, Charter School Revenue Bonds, Rocketship Education –	6/22 at 102.00	N/R	170,710
	Multiple Projects, Series 2014A, 7.250%, 6/01/43
250	California Statewide Communities Development Authority, School Facility Revenue Bonds,	7/21 at 100.00	BBB–	279,040
	Alliance College-Ready Public Schools, Series 2011A, 7.000%, 7/01/46
3,490	Total Education and Civic Organizations			3,912,061
	Health Care – 7.4%
115	California Health Facilities Financing Authority, Revenue Bonds, Lucile Salter Packard	8/24 at 100.00	AA	127,166
	Children’s Hospital, Series 2014A, 5.000%, 8/15/43
125	California Health Facilities Financing Authority, Revenue Bonds, Providence Health & Services,	10/24 at 100.00	AA	138,585
	Series 2014A, 5.000%, 10/01/38
235	California Health Facilities Financing Authority, Revenue Bonds, Rady Children’s Hospital –	8/21 at 100.00	A1	260,725
	San Diego, Series 2011, 5.250%, 8/15/41
425	California Statewide Community Development Authority, Revenue Bonds, Children’s Hospital of	8/17 at 100.00	BBB+	430,070
	Los Angeles, Series 2007, 5.000%, 8/15/47
545	California Statewide Community Development Authority, Revenue Bonds, Kaiser Permanente	8/16 at 100.00	A+	572,255
	System, Series 2001C, 5.250%, 8/01/31
1,505	California Statewide Community Development Authority, Revenue Bonds, Kaiser Permanente	4/17 at 100.00	A+	1,543,934
	System, Series 2007A, 4.750%, 4/01/33
540	Loma Linda, California, Hospital Revenue Bonds, Loma Linda University Medical Center, Series	12/17 at 100.00	BBB	598,973
	2008A, 8.250%, 12/01/38
500	Palomar Pomerado Health Care District, California, Certificates of Participation, Series 2009,	11/19 at 100.00	Ba1	528,260
	6.625%, 11/01/29
1,100	Palomar Pomerado Health Care District, California, Certificates of Participation, Series 2010,	11/20 at 100.00	Ba1	1,123,100
	6.000%, 11/01/41
670	San Buenaventura, California, Revenue Bonds, Community Memorial Health System, Series 2011,	12/21 at 100.00	BB	775,652
	7.500%, 12/01/41
800	Upland, California, Certificates of Participation, San Antonio Community Hospital, Series	1/21 at 100.00	A–	902,304
	2011, 6.500%, 1/01/41
6,560	Total Health Care			7,001,024
	Housing/Multifamily – 1.0%
375	California Municipal Finance Authority, Mobile Home Park Revenue Bonds, Caritas Projects	8/20 at 100.00	BBB	413,276
	Series 2010A, 6.400%, 8/15/45
395	California Municipal Finance Authority, Mobile Home Park Revenue Bonds, Caritas Projects	8/22 at 100.00	BBB	421,189
	Series 2012A, 5.500%, 8/15/47
	California Municipal Finance Authority, Mobile Home Park Senior Revenue Bonds, Caritas
	Affordable Housing, Inc. Projects, Series 2014A:
25	5.250%, 8/15/39	8/24 at 100.00	BBB	26,731
65	5.250%, 8/15/49	8/24 at 100.00	BBB	69,088
860	Total Housing/Multifamily			930,284
	Housing/Single Family – 0.0%
35	California Housing Finance Agency, Home Mortgage Revenue Bonds, Series 2006H, 5.750%,	2/16 at 100.00	A–	36,611
	8/01/30 – FGIC Insured (Alternative Minimum Tax)
	Industrials – 1.2%
1,015	California Pollution Control Financing Authority, Solid Waste Disposal Revenue Bonds, Republic	No Opt. Call	BBB+	1,108,877
	Services Inc., Series 2002C, 5.250%, 6/01/23 (Mandatory put 12/01/17) (Alternative Minimum Tax)
	Tax Obligation/General – 32.4%
1,650	California State, General Obligation Bonds, Various Purpose Series 2009, 5.500%, 11/01/39	11/19 at 100.00	Aa3	1,889,135
1,965	California State, General Obligation Bonds, Various Purpose Series 2011, 5.000%, 10/01/41	10/21 at 100.00	Aa3	2,154,230
2,000	California State, General Obligation Bonds, Various Purpose Series 2012, 5.250%, 4/01/35	4/22 at 100.00	Aa3	2,283,120
	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	AA–	4,413,919
1,750	0.000%, 2/01/17 – NPFG Insured	No Opt. Call	AA–	1,624,473
2,375	0.000%, 8/01/17 – NPFG Insured	No Opt. Call	AA–	2,165,691
2,345	0.000%, 2/01/18 – NPFG Insured	No Opt. Call	AA–	2,111,321
	Mountain View-Los Altos Union High School District, Santa Clara County, California, General
	Obligation Capital Appreciation Bonds, Series 1995C:
1,015	0.000%, 5/01/17 – NPFG Insured	No Opt. Call	Aa1	992,386
1,080	0.000%, 5/01/18 – NPFG Insured	No Opt. Call	Aa1	1,040,537
	Palomar Pomerado Health, California, General Obligation Bonds, Convertible Capital
	Appreciation, Election 2004 Series 2010A:
10,825	0.000%, 8/01/34	No Opt. Call	A+	4,038,157
3,250	0.000%, 8/01/35	No Opt. Call	A+	1,147,283
8,075	San Bernardino Community College District, California, General Obligation Bonds, Election of	No Opt. Call	Aa2	1,718,360
	2008 Series 2009B, 0.000%, 8/01/44
2,565	Sunnyvale School District, Santa Clara County, California, General Obligation Bonds, Series	9/15 at 100.00	AA+	2,701,945
	2005A, 5.000%, 9/01/26 – AGM Insured
4,250	West Hills Community College District, California, General Obligation Bonds, School Facilities	8/31 at 100.00	AA	2,470,823
	Improvement District 3, 2008 Election Series 2011, 0.000%, 8/01/38 – AGM Insured
47,795	Total Tax Obligation/General			30,751,380
	Tax Obligation/Limited – 27.0%
1,000	Bell Community Redevelopment Agency, California, Tax Allocation Bonds, Bell Project Area,	9/14 at 100.00	N/R	981,470
	Series 2003, 5.625%, 10/01/33 – RAAI Insured
2,000	California State Public Works Board, Lease Revenue Bonds, Department of Corrections &	9/23 at 100.00	A1	2,285,060
	Rehabilitation, Various Correctional Facilities Series 2013F, 5.250%, 9/01/33
2,190	California State Public Works Board, Lease Revenue Bonds, Department of Corrections,	No Opt. Call	AA–	2,363,426
	Calipatria State Prison, Series 1991A, 6.500%, 9/01/17 – NPFG Insured
1,500	California State Public Works Board, Lease Revenue Bonds, Various Capital Projects, Series	11/19 at 100.00	A1	1,797,570
	2009-I, 6.375%, 11/01/34
120	Capistrano Unified School District, Orange County, California, Special Tax Bonds, Community	9/15 at 100.00	AA–	125,184
	Facilities District 98-2, 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	368,280
	Bonds, Series 2006, 5.000%, 9/01/38 – AMBAC Insured
2,000	Escondido Joint Powers Financing Authority, California, Revenue Bonds, Water System Financing,	3/22 at 100.00	AA–	2,113,940
	Series 2012, 5.000%, 9/01/41
1,000	Fontana Public Financing Authority, California, Tax Allocation Revenue Bonds, North Fontana	10/15 at 100.00	A	1,016,020
	Redevelopment Project, Series 2005A, 5.000%, 10/01/32 – AMBAC Insured
270	Fontana Redevelopment Agency, San Bernardino County, California, Tax Allocation Bonds, Jurupa	10/14 at 100.00	A–	271,204
	Hills Redevelopment Project, Refunding Series 1997A, 5.500%, 10/01/27
250	Inglewood Redevelopment Agency, California, Tax Allocation Bonds, Merged Redevelopment	5/17 at 100.00	BBB+	257,873
	Project, Subordinate Lien Series 2007A-1, 5.000%, 5/01/23 – AMBAC Insured
	Irvine Unified School District, California, Special Tax Bonds, Community Facilities District
	Series 2006A:
55	5.000%, 9/01/26	9/16 at 100.00	N/R	56,227
130	5.125%, 9/01/36	9/16 at 100.00	N/R	132,673
1,215	Los Angeles Community Redevelopment Agency, California, Lease Revenue Bonds, Manchester	9/15 at 100.00	A1	1,238,243
	Social Services Project, Series 2005, 5.000%, 9/01/37 – AMBAC Insured
135	National City Community Development Commission, California, Tax Allocation Bonds, National	8/21 at 100.00	A–	169,748
	City Redevelopment Project, Series 2011, 6.500%, 8/01/24
1,000	Norco Redevelopment Agency, California, Tax Allocation Bonds, Project Area 1, Series 2009,	3/18 at 100.00	A+	1,124,430
	7.000%, 3/01/34
50	Novato Redevelopment Agency, California, Tax Allocation Bonds, Hamilton Field Redevelopment	9/21 at 100.00	BBB+	57,353
	Project, Series 2011, 6.750%, 9/01/40
	Patterson Public Finance Authority, Revenue Bonds, California, Community Facilities District
	2001-1, Senior Series 2013A:
350	5.250%, 9/01/30	9/23 at 100.00	N/R	378,168
320	5.750%, 9/01/39	9/23 at 100.00	N/R	349,341
60	Patterson Public Finance Authority, Revenue Bonds, California, Community Facilities District	9/23 at 100.00	N/R	65,121
	2001-1, Subordinate Lien Series 2013B , 5.875%, 9/01/39
	Perris Union High School District Financing Authority, Riverside County, California, Revenue
	Bonds, Series 2011:
50	6.000%, 9/01/33	9/21 at 100.00	N/R	51,610
100	6.125%, 9/01/41	9/21 at 100.00	N/R	103,191
415	Pittsburg Redevelopment Agency, California, Tax Allocation Bonds, Los Medanos Community	9/18 at 100.00	BBB–	451,711
	Development Project, Refunding Series 2008A, 6.500%, 9/01/28
160	Rancho Santa Fe CSD Financing Authority, California, Revenue Bonds, Superior Lien Series	9/21 at 100.00	BBB+	179,891
	2011A, 5.750%, 9/01/30
30	Riverside County Redevelopment Agency, California, Tax Allocation Bonds, Jurupa Valley Project	10/21 at 100.00	A–	36,113
	Area, Series 2011B, 6.500%, 10/01/25
605	Sacramento City Financing Authority, California, Lease Revenue Refunding Bonds, Series 1993A,	No Opt. Call	AA–	683,723
	5.400%, 11/01/20 – NPFG Insured
1,365	San Diego County Regional Transportation Commission, California, Sales Tax Revenue Bonds,	4/22 at 100.00	AAA	1,508,270
	Series 2012A, 5.000%, 4/01/42
25	San Francisco Redevelopment Finance Authority, California, Tax Allocation Revenue Bonds,	2/21 at 100.00	A–	29,896
	Mission Bay North Redevelopment Project, Series 2011C, 6.750%, 8/01/41
	San Francisco Redevelopment Financing Authority, California, Tax Allocation Revenue Bonds,
	Mission Bay South Redevelopment Project, Series 2011D:
25	7.000%, 8/01/33	2/21 at 100.00	BBB+	28,504
30	7.000%, 8/01/41	2/21 at 100.00	BBB+	33,733
615	San Jose Redevelopment Agency, California, Tax Allocation Bonds, Merged Area Redevelopment	8/17 at 100.00	AA–	643,505
	Project, Series 2006C, 5.000%, 8/01/25 – NPFG Insured
3,000	San Mateo County Transit District, California, Sales Tax Revenue Bonds, Series 2005A, 5.000%,	6/15 at 100.00	AA	3,131,400
	6/01/21 – NPFG Insured
1,000	Santa Clara County Board of Education, California, Certificates of Participation, Series 2002,	9/14 at 100.00	AA–	1,000,670
	5.000%, 4/01/25 – NPFG Insured
1,000	Santa Clara Valley Transportation Authority, California, Sales Tax Revenue Bonds, Series	4/17 at 100.00	AA+	1,092,750
	2007A, 5.000%, 4/01/36 – AMBAC Insured
40	Signal Hill Redevelopment Agency, California, Project 1 Tax Allocation Bonds, Series 2011,	4/21 at 100.00	N/R	44,837
	7.000%, 10/01/26
1,000	Travis Unified School District, Solano County, California, Certificates of Participation,	9/16 at 100.00	A3	1,023,140
	Series 2006, 5.000%, 9/01/26 – FGIC Insured
360	Turlock Public Financing Authority, California, Tax Allocation Revenue Bonds, Series 2011,	3/21 at 100.00	BBB+	416,772
	7.500%, 9/01/39
70	Yorba Linda Redevelopment Agency, Orange County, California, Tax Allocation Revenue Bonds,	9/21 at 100.00	A–	82,942
	Yorba Linda Redevelopment Project, Subordinate Lien Series 2011A, 6.500%, 9/01/32
23,895	Total Tax Obligation/Limited			25,693,989
	Transportation – 5.8%
1,150	Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Bonds, Series	7/14 at 100.00	BBB–	1,150,725
	1995A, 5.000%, 1/01/35
530	Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Refunding	1/24 at 100.00	BB+	618,653
	Bonds, Junior Lien Series 2013C, 6.500%, 1/15/43
	Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Refunding
	Bonds, Series 2013A:
1,170	5.750%, 1/15/46	1/24 at 100.00	BBB–	1,325,107
1,175	6.000%, 1/15/53	1/24 at 100.00	BBB–	1,348,806
955	Port of Oakland, California, Revenue Bonds, Refunding Series 2012P, 5.000%, 5/01/31	No Opt. Call	A+	1,035,698
	(Alternative Minimum Tax)
4,980	Total Transportation			5,478,989
	U.S. Guaranteed – 4.2%(4)
100	Roseville Joint Union High School District, Placer County, California, General Obligation	8/15 at 100.00	AA(4)	105,287
	Bonds, Series 2006B, 5.000%, 8/01/27 (Pre-refunded 8/01/15) – FGIC Insured
3,220	Sacramento City Unified School District, Sacramento County, California, General Obligation	7/15 at 100.00	A1(4)	3,376,942
	Bonds, Series 2005, 5.000%, 7/01/27 (Pre-refunded 7/01/15) – NPFG Insured
250	Sacramento County Sanitation Districts Financing Authority, California, Revenue Bonds, Series	6/16 at 100.00	AA(4)	264,200
	2006, 5.000%, 12/01/31 (Pre-refunded 6/01/16) – FGIC Insured
225	San Mateo Union High School District, San Mateo County, California, Certificates of Participation,	12/17 at 100.00	N/R(4)	258,206
	Phase 1, Series 2007A, 5.000%, 12/15/30 (Pre-refunded 12/15/17) – AMBAC Insured
3,795	Total U.S. Guaranteed			4,004,635
	Utilities – 6.9%
1,000	Imperial Irrigation District, California, Electric System Revenue Bonds, Refunding Series	11/20 at 100.00	AA–	1,111,220
	2011A, 5.500%, 11/01/41
645	Long Beach Bond Finance Authority, California, Natural Gas Purchase Revenue Bonds, Series	No Opt. Call	A	760,494
	2007A, 5.500%, 11/15/37
7,600	Merced Irrigation District, California, Certificates of Participation, Water and Hydroelectric	9/16 at 64.56	A	4,479,132
	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	217,307
	9/01/31 – SYNCORA GTY Insured
9,460	Total Utilities			6,568,153
	Water and Sewer – 3.0%
1,000	Bay Area Water Supply and Conservation Agency, California, Revenue Bonds, Capital Cost	4/23 at 100.00	AA–	1,132,740
	Recovery Prepayment Program, Series 2013A, 5.000%, 10/01/34
	California Pollution Control Financing Authority, Water Furnishing Revenue Bonds, Poseidon
	Resources Channelside LP Desalination Project, Series 2012:
375	5.000%, 7/01/37 (Alternative Minimum Tax)	No Opt. Call	Baa3	387,739
1,160	5.000%, 11/21/45 (Alternative Minimum Tax)	No Opt. Call	Baa3	1,191,552
150	Healdsburg Public Financing Authority, California, Wastewater Revenue Bonds, Series 2006,	4/16 at 100.00	AA–	158,543
	5.000%, 4/01/36 – NPFG Insured
2,685	Total Water and Sewer			2,870,574
$ 108,950	Total Long-Term Investments (cost $85,241,511)			91,961,544
	Other Assets Less Liabilities - 3.2%			3,042,740
	Net Assets - 100%			$ 95,004,284

Fair Value Measurements

Fair value is defined as the price that would be received upon selling an investment or transferring a liability in an orderly transaction to an independent buyer in the principal or most advantageous market for the investment. A three-tier hierarchy is used to maximize the use of observable market data and minimize the use of unobservable inputs and to establish classification of fair value measurements for disclosure purposes. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability. Observable inputs are based on market data obtained from sources independent of the reporting entity. Unobservable inputs reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability. Unobservable inputs are based on the best information available in the circumstances. The following is a summary of the three-tiered hierarchy of valuation input levels.

Level 1 – Inputs are unadjusted and prices are determined using quoted prices in active markets for identical securities.

Level 2 – Prices are determined using other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.).

Level 3 – Prices are determined using 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 risks associated with investing in those securities. The following is a summary of the Fund’s fair value measurements as of the end of the reporting period:

	Level 1	Level 2	Level 3	Total
Long-Term Investments:
Municipal Bonds	$ —	$91,961,544	$ —	$91,961,544

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.

As of June 30, 2014, the cost of investments was $85,220,789.

Gross unrealized appreciation and gross unrealized depreciation of investments as of June 30, 2014, were as follows:

Gross unrealized:
Appreciation	$7,183,366
Depreciation	(442,611)
Net unrealized appreciation (depreciation) of investments	$6,740,755

(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 Investors 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. Certain bonds backed by U.S. Government or
	agency securities are regarded as having an implied rating equal to the rating of such securities.

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: 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: August 29, 2014

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: August 29, 2014

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

Stephen D. Foy

Vice President and Controller (principal financial officer)

Date: August 29, 2014

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