Morag MacLeod Simchak, 64, who retired as women's activities adviser at the Agency for International Development's labor office in 1977 after more than 15 years of government service, died of cancer Tuesday at her Washington home.

She joined the Labor Department in 1961, as legislative assistant to then assistant secretary of labor Esther Peterson.

Mrs. Simchak helped draft and shepherd the federal equal pay act of 1963 into law. She also worked on bills aimed at eliminating age discrimination during her years as the Labor Department's liaison with Capitol Hill.

She joined the State Department in 1975, where she helped organize programs for the advancement of women in Africa, Asia, and Latin America, as part of an AID program.

She was a delegate to the World Conference of the International Women's Year held in Mexico City in 1975.

Mrs. Simchak belonged to the Episcopal Church of St. Stephen and the Incarnation here. She served on a number of diocesan committees, and was the National Episcopal Church's representative at a leadership conference on civil rights. She also was a member of the bishop's advisory committee on human affairs.

She was born in Britain and came to this country in 1940. She moved to Washington in 1945 after working for the U.N. Information Office and the United Nations Relief and Rehabilitation Administration (UNRRA).

Mrs Simchak rose from secretary to assistant legislative assistant with the United Rubber Workers International Union before beginning her federal government career.

She had been president of the Washington chapter of the Industrial Relations Research Association.

She is survived by a daughter, Anna Zamoyska Bradley, two sons, Matthew S. and Thomas M., all of Washington, and three grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the St. Francis Burial and Counseling Society in Washington.