EX-4
from 485APOS
1 page
Consent of Ernst & Young Llp, Independent Auditors We Consent to the References to Our Firm Under the Captions "Financial Highlights" in the Pioneer Fund's Class A, Class B and Class C Shares, in the Class R Shares, and in the Class Y Shares Prospectuses and "Independent Auditors" and "Financial Statements" in the Pioneer Fund Class A, Class B, Class C, Class R and Class Y Shares Statement of Additional Information, and to the Incorporation by Reference of Our Report, Dated February 17, 2004, on the Financial Statements and Financial Highlights of Pioneer Fund in the Annual Report to the Shareowners for the Year Ended December 31, 2003, in Post-Effective Amendment Number 75 to the Registration Statement (Form N-1a, 1933 Act File No. 2-25980). /S/ Ernst & Young Llp Boston, Massachusetts April 5, 2004
12/34/56