Henry G. Rieber, 77, a retired Navy Department architect, died Thursday at his home in Adelphi after a long illness.

He was an acting branch manager in the office of the assistant chief for construction, Bureau of Yards and Docks, at his retirement in 1965.

Born in Philadelphia, Mr. Rieber attended Pennsylvania State College. He had an architectural practice in Philadelphia before joining government services as an associate architect with the War Department in 1933.

Mr. Rieber then was with the Federal Works Agency and transferred to the Bureau of Yards and Docks in 1941 as an associate architect.

He was project manager of construction in the development of the Naval Academy at Annapolis and the postgraduate school at Monterey, Calif. He also had managed projects at naval war colleges and officer candidate schools and has coordinated housing projects for naval personnel.

The Navy Department honored Mr. Rieber with its Meritorious Civilian Services Awards and two Superior Performance Awards.

He is survived by his wife, Hilda R., of the home; a daughter, Leslie R. Watson, of Oxon Hill, and one grandchild.

The family suggests that expressions of sympathy may be in the form on contributions to the building fund of the Washington Cathedral.