John H. Waters, 61, a retired trial lawyer in the antiturst division of the Justice Department, died Monday at Western Maryland Center in Hagerstown of complications from diabetes. He had been a patient there and earlier at Suburban Hospital in Bethesda since suffering a stroke last August.

Mr. Waters retired from the Justice Department in 1974 after more than 30 years in the antitrust division. He was considered on authority on oil exports and had received a number of Meritorious Achievement and Sustained Superior Service awards.

He was born in Germantown, Md., and had spent most of his life in Montgomery County where his ancestors had settled in the late 1600s. His home was in Bethesda.

Mr. Waters received a law degree from Southeastern University in Washington after graduating from Richard Montgomery High School in Rockville at the age of 15. He also studied at George Washington University Law School.

During World War II, he served with the Army Air Corps as a bomber navigator in the South Pacific and was awarded a number of decorations.

He is survived by his wife, Dorothy R., of Bethesda, a son, John S., of Winston-Salem, N.C.; a daughter Judith Hochman of Flemington, N.J. and two grandchildren.