Timothy N. Sheehan, 84, a retired attorney for the Veterans Administration, died Wednesday at Georgetown University Hospital after a heart attack. He lived in Washington.

Born and reared in Taunton, Mass., Mr. Sheehan came to Washington in 1916 to work as a stenographer for the Veterans Administration. Except for service in the Army in World War I, he remained with the VA until retiring in 1974.

He became an attorney for the VA after earning a law degree from National University School of Law, now part of George Washington University, in 1924. Before retiring, he served as chief of special claims, as a congressional liaison man, as chief of contracts for vocational rehabilitation and, during World War II, as chairman of the test rating branch, which he had helped establish.

Mr. Sheehan was a former president of the Cathedral Heights-Cleveland Park Citizens Association and a member of the James T. Brady Post of the Catholic War Veterans. He was active in the St. Vincent de Paul and Holy Name societies at the Church of the Annunciation here.

His wife, the former Rose Clark, died in 1974. Survivors include a daughter, Rosemary Arrington of Rockville, a granddaughter and a great-granddaughter.