Mary M. Porter, 62, a former cochairman of the Family Life Movement of the Catholic Archdiocese of Washington and a participant in many other church and civic activities, died of cancer March 17 at her home in Hyattsville.

Mrs. Porter was born in Menominee, Mich. She moved to the Washington area in 1941. She was a member of St. Bernard's Catholic Church in Riverdale and had been its organist and a member of the choir and the first elected parish council. She helped set up the parish's first library and religious goods store.

She was a cochairman of the archdiocesan Family Life Movement from 1959 to 1961. She helped establish Cana clubs, which are religious programs for couples, at St. Bernard's and at the St. James Catholic Church in Mount Rainier. She was a lecturer on Catholic family living at various seminaries, colleges and high schools.

In 1983, Mrs. Porter graduated from the Education for Parish Service Program at Trinity College and since then had been a discussion leader with the program.

Mrs. Porter was a former member of the Prince George's County Catholic Interracial Council, a volunteer tutor at the Joseph P. Kennedy Institute in Washington, which helps people with learning disabilities, and a volunteer in founding the first public library in Mount Rainier.

Survivors include her husband of 43 years, Thomas H. Porter of Hyattsville; four daughters, Mary L. Novak of Norfolk, Monica J. Walsh of Minneapolis, Andrea C. Porter of Hyattsville, and Eleanor F. Porter of Takoma Park; five sons, William J. of Kettering, Ohio, Robert T. of Arlington, Brian J. of Seabrook, Md., Kenneth B. of Baltimore, and David G. of Hyattsville; one sister, Patricia M. Anderson of Dover, Del.; two brothers, William L. Menacher of Toledo, Ohio, and James B. Menacher of Wyoming, Mich., and 13 grandchildren.