Minerva R. Fisher, 63, a retired social worker in Fairfax County schools who was active in and helped to establish several service organizations in Fairfax, died of cancer April 20 at her home in Falls Church.

In about 1968, Ms. Fisher became a social worker, or visiting teacher, in Fairfax and worked at the Mount Vernon High School, the Walt Whitman Intermediate School and seven elementary schools before retiring for medical reasons in 1978.

A native of Pittsburgh, Pa., she was a social worker there and in Chicago, Ill., before coming to this area in the early 1960s. She earned a graduate degree in social work from the University of Pittsburg.

In the mid-1960s, Mrs. Fisher helped organize Fairfax's Project Headstart program and served as director of its volunteer programs in 1965 and 1966. She was chairman of the health committee of Fairfax Community Action Program (FCAP) from 1966 to 1971. In 1978, under her leadership and with the help of the Fairfax County Medical Society and Auxiliary, under the direction of Dr. Thomas Fulcher, the committee established FCAP's MEDCAP program for the poor.

Her other volunteer work included 15 years as a member of the Fairfax County Council on Human Relations, where she also was public affairs chairman. She was a member for 15 years on the National Committee on Public Affairs, where she currently was working on federal health care legislation as a member of the health committee. She also served for five years as a member of Virginia's Advisory Committee to the U.S. Civil Rights Commission.

She also was a member of the National Council of Jewish Women since 1951, where she was active in public affairs and educational programs.

Her husband, Morris A. Fisher, a research chemist and consultant on anti-pollution legislation, died in 1977.

In 1978, Mrs. Fisher received the Human Rights Award of the Fairfax Human Rights Committee. A resolution passed by the Fairfax County Board of Supervisors earlier this month provides that a home for retarded children under construction will bear Mrs. Fisher's name in recognition of her years of community service.

Survivors include a son, Dr. Charles P. Fisher, of Berkely, Calif.; a sister, Molly Munitz, of Tamarac, Fla.; a brother, Martin Reiter, of Evanston, Ill., and a grandson.