William A. Moncure, 72, a retired attorney in Alexandria and a former president of the Virginia State Bar Association, died Friday at the Veterans Administration Hospital at Perry Point, Md. He had undergone an operation for a brain tumor.

Mr. Moncure was born in Stafford County, Va., and moved to Alexandria in his boyhood. He graduated from Episcopal High School there and then earned bachelor's and law degrees at the University of Virginia.

He established a private law practice in Alexandria and remained in it until 1978, when he retired from the firm of Richard, Moncure & Watts.

Mr. Moncure served as president of the Virginia State Bar Association for 1967-1968.

During World War II, Mr. Moncure served in the Judge Advocate General's Office of the Army and was assigned to duty in Europe. He rose to the rank of lieutenant colonel.

He was a former president of the Alexandria Rotary Club, the Alexandria Chamber of Commerce and the Belle Haven Country Club. He also was a member of Christ Church in Alexandria and of the Chevy Chase Country Club.

Survivors include his wife, the former Margaret McNeale, of Alexandria; three sons, Richard, John and William A. Jr., all of Alexandria; a daughter, Douglas Moncure, also of Alexandria; a stepson, William A. Moffett, a Foreign Service officer stationed in Jamaica; one sister, Margaret Moncure Boothe, of Alexandria, and one brother, Richard, of Chattanooga, Tenn.

The family suggests that expressions of sympathy be in the form of contributions to a charity of one's choice.