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

                                   FORM N-Q

                   QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS
    OF REGISTERED MANAGEMENT INVESTMENT COMPANY



  Investment Company Act file number 811-01466


                         Pioneer Fund
               (Exact name of registrant as specified in charter)


                       60 State Street, Boston, MA 02109
              (Address of principal executive offices) (ZIP code)


            Terrence J. Cullen, Pioneer Investment Management, Inc.,
                       60 State Street, Boston, MA 02109
                    (Name and address of agent for service)


Registrant's telephone number, including area code:  (617) 742-7825


Date of fiscal year end:  December 31

Date of reporting period:  September 30, 2016

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
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 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. ss. 3507.


<PAGE>
ITEM 1. Schedule of Investments.

File the schedules as of the close of the reporting period as set forth in
ss. 210.12-12  12-14 of Regulation S-X [17 CFR 210.12-12  12-14]. The
schedules need not be audited.

		Pioneer Fund
		Schedule of Investments 9/30/2016
	Shares			Value
		COMMON STOCKS - 98.7%
		Energy - 6.9%
		Oil & Gas Equipment & Services - 1.2%
	732,000	Schlumberger, Ltd.	$	57,564,480
		Integrated Oil & Gas - 3.8%
	1,736,000	Chevron Corp.	$	178,669,120
		Oil & Gas Exploration & Production - 1.6%
	745,000	EOG Resources, Inc.	$	72,048,950
		Oil & Gas Refining & Marketing - 0.3%
	175,500	Phillips 66	$	14,136,525
		Total Energy	$	322,419,075
		Materials - 3.4%
		Diversified Chemicals - 1.9%
	1,674,700	The Dow Chemical Co.	$	86,799,701
		Fertilizers & Agricultural Chemicals - 0.1%
	75,000	Agrium, Inc.	$	6,801,750
		Specialty Chemicals - 1.4%
	493,000	Ecolab, Inc.	$	60,007,960
	44,000	The Valspar Corp.		4,667,080
			$	64,675,040
		Total Materials	$	158,276,491
		Capital Goods - 6.6%
		Industrial Conglomerates - 3.4%
	4,180,000	General Electric Co.	$	123,811,600
	276,000	Honeywell International, Inc.		32,178,840
			$	155,990,440
		Construction & Farm Machinery & Heavy Trucks - 0.5%
	418,000	PACCAR, Inc.	$	24,570,040
		Industrial Machinery - 2.7%
	629,500	Illinois Tool Works, Inc.	$	75,439,280
	774,000	Ingersoll-Rand Plc		52,585,560
			$	128,024,840
		Total Capital Goods	$	308,585,320
		Transportation - 3.3%
		Railroads - 3.3%
	2,827,000	CSX Corp.	$	86,223,500
	687,500	Union Pacific Corp.		67,051,875
			$	153,275,375
		Total Transportation	$	153,275,375
		Media - 2.9%
		Broadcasting - 0.9%
	654,500	Scripps Networks Interactive, Inc.	$	41,554,205
		Cable & Satellite - 0.2%
	170,000	DISH Network Corp.	$	9,312,600
		Movies & Entertainment - 1.7%
	850,783	The Walt Disney Co.	$	79,003,709
		Publishing - 0.1%
	95,000	John Wiley & Sons, Inc. (Class A)	$	4,902,950
		Total Media	$	134,773,464
		Retailing - 6.8%
		General Merchandise Stores - 1.1%
	740,700	Dollar General Corp.	$	51,841,593
		Apparel Retail - 1.9%
	165,000	Ross Stores, Inc.	$	10,609,500
	1,028,000	The TJX Companies, Inc.		76,873,840
			$	87,483,340
		Home Improvement Retail - 2.8%
	1,005,500	The Home Depot, Inc.	$	129,387,740
		Specialty Stores - 1.0%
	630,000	Tiffany & Co.	$	45,756,900
		Total Retailing	$	314,469,573
		Food & Staples Retailing - 2.0%
		Drug Retail - 2.0%
	1,025,000	CVS Health Corp.	$	91,214,750
		Total Food & Staples Retailing	$	91,214,750
		Food, Beverage & Tobacco - 6.5%
		Soft Drinks - 2.6%
	392,823	Dr. Pepper Snapple Group, Inc.	$	35,868,668
	2,050,000	The Coca-Cola Co.		86,756,000
			$	122,624,668
		Packaged Foods & Meats - 3.9%
	900,000	Campbell Soup Co.	$	49,230,000
	1,082,000	General Mills, Inc.		69,118,160
	651,985	The Hershey Co.		62,329,766
			$	180,677,926
		Total Food, Beverage & Tobacco	$	303,302,594
		Household & Personal Products - 0.5%
		Household Products - 0.5%
	183,944	The Clorox Co.	$	23,026,110
		Total Household & Personal Products	$	23,026,110
		Health Care Equipment & Services - 6.6%
		Health Care Equipment - 5.6%
	670,000	Abbott Laboratories	$	28,334,300
	449,863	Becton Dickinson and Co.		80,853,877
	175,004	CR Bard, Inc.		39,249,897
	1,300,000	Medtronic PLC		112,320,000
			$	260,758,074
		Managed Health Care - 1.0%
	386,300	Aetna, Inc.	$	44,598,335
		Total Health Care Equipment & Services	$	305,356,409
		Pharmaceuticals, Biotechnology & Life Sciences - 9.9%
		Biotechnology - 2.4%
	676,326	AbbVie, Inc.	$	42,655,881
	652,000	Celgene Corp. *		68,153,560
			$	110,809,441
		Pharmaceuticals - 6.2%
	435,446	Eli Lilly & Co.	$	34,948,896
	4,815,000	Pfizer, Inc.		163,084,050
	1,691,000	Zoetis, Inc.		87,948,910
			$	285,981,856
		Life Sciences Tools & Services - 1.3%
	393,000	Thermo Fisher Scientific, Inc.	$	62,510,580
		Total Pharmaceuticals, Biotechnology & Life Sciences	$	459,301,877
		Banks - 7.2%
		Diversified Banks - 5.1%
	2,785,000	US Bancorp	$	119,448,650
	2,700,000	Wells Fargo & Co.		119,556,000
			$	239,004,650
		Regional Banks - 2.1%
	1,060,000	The PNC Financial Services Group, Inc.	$	95,495,400
		Total Banks	$	334,500,050
		Diversified Financials - 2.0%
		Asset Management & Custody Banks - 0.0%
	5,000	State Street Corp.	$	348,150
		Investment Banking & Brokerage - 2.0%
	566,500	The Goldman Sachs Group, Inc.	$	91,359,455
		Total Diversified Financials	$	91,707,605
		Insurance - 3.6%
		Multi-line Insurance - 0.6%
	632,000	The Hartford Financial Services Group, Inc.	$	27,062,240
		Property & Casualty Insurance - 3.0%
	702,500	Chubb, Ltd.	$	88,269,125
	472,200	The Travelers Companies, Inc.		54,090,510
			$	142,359,635
		Total Insurance	$	169,421,875
		Software & Services - 16.9%
		Internet Software & Services - 7.6%
	235,400	Alphabet, Inc. (Class A) *	$	189,275,724
	49,264	Alphabet, Inc. (Class C) *		38,292,415
	999,500	eBay, Inc. *		32,883,550
	738,993	Facebook, Inc. *		94,790,632
			$	355,242,321
		Data Processing & Outsourced Services - 3.4%
	457,000	Automatic Data Processing, Inc.	$	40,307,400
	437,780	Fiserv, Inc. *		43,545,977
	900,000	Visa, Inc.		74,430,000
			$	158,283,377
		Systems Software - 5.9%
	335,000	Check Point Software Technologies, Ltd. *	$	25,999,350
	3,430,000	Microsoft Corp.		197,568,000
	1,255,000	Oracle Corp.		49,296,400
			$	272,863,750
		Total Software & Services	$	786,389,448
		Technology Hardware & Equipment - 2.8%
		Computer Storage & Peripherals - 2.8%
	1,157,000	Apple, Inc.	$	130,798,850
		Total Technology Hardware & Equipment	$	130,798,850
		Semiconductors & Semiconductor Equipment - 3.5%
		Semiconductor Equipment - 0.3%
	150,500	Lam Research Corp.	$	14,253,855
		Semiconductors - 3.2%
	1,300,000	Analog Devices, Inc.	$	83,785,000
	1,740,000	Intel Corp.		65,685,000
			$	149,470,000
		Total Semiconductors & Semiconductor Equipment	$	163,723,855
		Telecommunication Services - 3.3%
		Integrated Telecommunication Services - 3.3%
	3,720,000	AT&T, Inc.	$	151,069,200
		Total Telecommunication Services	$	151,069,200
		Utilities - 4.0%
		Electric Utilities - 4.0%
	2,870,000	American Electric Power Co., Inc.	$	184,282,700
		Total Utilities	$	184,282,700
		TOTAL COMMON STOCKS
		(Cost $3,116,424,917)	$	4,585,894,621
		TOTAL INVESTMENT IN SECURITIES - 98.7%
		(Cost $3,116,424,917) (a)	$	4,585,894,621
		OTHER ASSETS & LIABILITIES - 1.3%	$	61,033,744
		TOTAL NET ASSETS - 100.0%	$	4,646,928,365
	*	Non-income producing security.
	(a)	At September 30, 2016, the net unrealized appreciation on investments based on
		cost for federal income tax purposes of $3,116,872,715 was as follows:
		Aggregate gross unrealized appreciation for all investments in which
		there is an excess of value over tax cost	$	1,471,356,193
		Aggregate gross unrealized depreciation for all investments in which
		there is an excess of tax cost over value		(2,334,287)
		Net unrealized appreciation	$	1,469,021,906
Various inputs are used in determining the value of the Fund's investments.  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 the Portfolio's own assumptions in determining fair value of investments).
The following is a summary of the inputs used as of September 30, 2016, in valuing the Fund's investments:

	Level 1	Level 2	Level 3	Total
Common Stocks	$                      4,585,894,621	$           -	$           -	$                      4,585,894,621
Total	$                  4,585,894,621	$           -	$           -	$                  4,585,894,621
During the period ended September 30, 2016, there were no transfers between Levels 1, 2 and 3.

ITEM 2. CONTROLS AND PROCEDURES. (a) Disclose the conclusions of the registrant's principal executive and principal financial officers, or persons performing similar functions, regarding the effectiveness of the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Act (17 CFR 270.30a-3(c))) as of a date within 90 days of the filing date of the report that includes the disclosure required by this paragraph, based on the evaluation of these controls and procedures required by Rule 30a-3(b) under the Act (17 CFR 270.30a-3(b))) and Rule 13a-15(b) or 15d-15(b) under the Exchange Act (17 CFR 240.13a-15(b) or 240.15d-15(b)). The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this report. (b) Disclose any change in the registrant's internal controls over financial reporting (as defined in Rule 30a-3(d) under the Act (17 CFR 270.30a-3(d)) that occurred during the registrant's last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. There were no significant changes in the registrant's internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report 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 Act (17 CFR 270.30a-2(a)), exactly as set forth below: CERTIFICATIONS I, [identify the certifying individual], certify that: 1. I have reviewed this report on Form N-Q of [identify registrant]; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; 3. Based on my knowledge, the schedules of investments included in this report fairly present in all material respects the investments of the registrant as of the end of the fiscal quarter for which the report is filed; 4. The registrants other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have: (a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared; (b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles; (c) Evaluated the effectiveness of the registrants disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report, based on such evaluation; and (d) Disclosed in this report any change in the registrants internal control over financial reporting that occurred during the registrants most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrants internal control over financial reporting; and 5. The registrants other certifying officer(s) and I have disclosed to the registrants auditors and the audit committee of the registrants board of directors (or persons performing the equivalent functions): (a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrants ability to record, process, summarize, and report financial information; and (b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants internal control over financial reporting. Date: [Signature] [Title] Filed herewith. <PAGE> SIGNATURES [See General Instruction F] 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) Pioneer Fund By (Signature and Title)* /s/ Lisa M.Jones ----------------------- Lisa M.Jones, President and Chief Executive Officer Date November 28, 2016 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/ Lisa M.Jones ----------------------- Lisa M.Jones, President and Chief Executive Officer Date November 28, 2016 By (Signature and Title)* /s/ Mark E. Bradley ----------------- Mark E. Bradley, Treasurer and Chief Accounting and Financial Officer Date November 28, 2016 * Print the name and title of each signing officer under his or her signature.