William H. Haggerty, 49, the Navy Department manager of the shore commands and activities directly accountable to the chief of naval operations, died of pneumonia Thursday at Georgetown University Hospital.

Mr. Haggerty, who began his civil service career at the age of 18, held the title of director of U.S. Navy field support activity and assistant for Field Support for the director of naval administration at the time of his death.

As such, he was responsible for the administration of about 15,000 civilian and military jobs at about 200 naval shore installations, including the U.S. Naval Academy at Annapolis.

He was born and reared in Scranton, Pa. He joined the Army when he was 16 and served for two years. He moved to the Washington area in 1948.

He had attended the University of Scranton before moving here and the University of Maryland after he arrived. At a ceremony marking his 30th year of federal service, he was cited for his skill in administration and financial management.

Mr. Haggerty began his government career with the Veterans Administration. He later moved to the Navy's Bureau of Ships and then to the Goddard Space Flight Center of the National Aeronautics and Space Administration. He went back to Navy in the early 1960s.

Survivors include his wife, Provincia, of the home in Forestville, and his mother, Helen Haggerty, and a sister Marjorie Walsh, both of Scranton.

The family suggests that expressions of sympathy be in the form of contributions to Georgetown University Hospital.