Marion Young Boothby, 85, who had been active in community and philanthropic work, died Thursday at her home in Chevy Chase. She suffered from a heart ailment.

She was the widow of Everett J. Boothby, former president and chairman of the board of the Washington Gas Light Co., who died in 1973.

Mrs. Boothby was born in Dorchester, Mass, and grew up in Arlington, Mass. Both her father and her grandfather had owned fishing vessels that operated in the Atlantic, supplying sea food to Boston and other major eastern cities.

As a young woman she played piano for dancing classes in Arlington, Mass., and directed a small orchestra that played at various affairs in that area. She came to Washington with her husband in 1932, when he became an official of the Washington Gas Light Co.

During World War II, Mrs. Boothby was active in American Red Cross work. She also had been active in the Washington Ki-Wives Club of Kiwanis. For many years, she operated the flower booth of the Crippled Chridren's Society at the annual Armory flower show.

She helped prepare works in Braille for blind students. She was a member of the Daughters of the American Revolution.

Her survivors include a nephew, Alfred Y. Brooks, of Fairfax, whom she reared.

The family suggests that expressions of sympathy may be in the form of contributions to the Shriners' Hospitals for Cripped Children in care of Almas Temple in Washington.