Harry W. Geiglein, 63, a retired director of security at George Washington University and a former Secret Service agent, died April 20 at the Shady Grove Adventist Hospital in Gaithersburg after a heart attack. He was stricken at his home in Rockville.

Mr. Geiglein, who was born in Baltimore, joined the Secret Service there in 1941. Following World War II service in Army counter-intelligence in the China-Burma-India Theater, he returned to the Secret Service. He worked Louisville and Chicago before being assigned here as special agent in charge of the Washington field office. He retired in 1969.

Mr. Geiglein was director of safety and security at GW from 1969 until his second retirement in 1980.

He was a founder and a former president of the Association of Former Agents of the Secret Service and a member of the International Association of Chiefs of Police, the American Society for Industrial Security and other professional groups.

He also was a member of St. Jude's Parish in Rockville, the Knights of Columbus, the American Legion and the Argyle Country Club.

Survivors include his wife, Mary, of Rockville; a son, Harry W. Jr., of Arlington; six daughters, Mary Joanne Beckwith of New Carrollton, Susan C. Kennell of Highland, Md., Nancy J. Brice of Annandale, Barbara E. Sonneman of Silver Spring, and Patricia A. and Sharon M. Geiglein, both of Rockville, and five grandchildren.