Charles Gary Cooper, 76, a retired corporation executive who lived in Washington for more than 20 years, died Monday in a La Jolla, Calif., convelescent home after a series of strokes.

He came to Washington in 1933 as district sales manager of the Washington and southeast regional office of the old Cooper-Bessemer Corporation. The company built ship and submarine engines.

In 1957, Mr. Cooper transferred to the company's New York office as vice president of the international division. He returned here in 1966 and spent two years as the Washington corporate representative of Cooper Industries before retiring in 1968. He moved to La Jolla four years later.

Mr. Cooper was a native of Gloucester, Mass., and a 1926 graduate of Yale University.

He had been a director of theWashington Society of Engineers and a councilor of the American Societyof Naval Architects and Marine Engineers.

Mr. Cooper had been president of the Yale Club of Washington and the area alumni association.

He also belonged to the Chevy Chase and Burning Tree country clubs and the Metropolitan Club in Washington.

His first wife, the former Dorothy A. Booth, died in 1949.

He is survived by his second wife, Marguerite H., ofthe home; a son, David B., of Akron; a sister, Louise C. Talbot, of Akron; a sister, Louise C. Talbot, of Needham, Mass., and two grandchildren.