Dr. William Walter Belson, 48, a Department of the Army physician, died Monday in his office in Fort Myer following a heart attack.

Dr. Belson was born in Milwaukee and grew up in Washington. He graduated from Gonzaga High School here and earned a bachelor's degree at Catholic University. He earned his medical degree at Marquette University in Milwaukee, then returned to Washington to intern at Providence Hospital.

Following his internship, he joined the Department of the Army as a civillian physician on the staff at Fort Myer. He conducted a general practice there and had received a number of commendations, one of which cited him fo "his unselfish concern for his patients."

Dr, Belson was a member of the parish of Our Lady of Lourdes Catholic Church in Bethesda. He served two terms as president of the board of the parish school.

Survivors include his wife , the former Margaret Faust, of the home in Bethesda; a son, William, a student at Marquette University; three daughters, Margaret, Maureen and Eileen, all of the home; his father, Walter W., alos of Bethesda; a brother, James A. Belson, a judge of the D.C. Superior Court, of Washington, and two sisters, Mrs. Thomas Flynn, of New Canaan, Conn., and Mrs. Thomas Sullivan, of Weston, Mass.