Harold H. Flickinger, 72, a retired transportation specialist who had worked for the Departments of the Army and Air Force and for the Peace Corps, died of a heart attack Thursday at Holy Cross Hospital.

He retired in 1968 from the Peace Corps here. He had joined in 1961 to help establish its transportation system. In 1966-67, he was in charge of its transportation in the South Pacific.

Mr. Flickinger came to Washington in 1937 to serve with the Railroad Retirement Board. After the outbreak of World War II, he became a civilian transportation specialist with the U.S. Army.

Toward the end of the war, he was granted a leave of absence from his Army job and joined the American Red Cross. He was responsible for liason with government departments, and served in the South Pacific and Hawaii.

He returned to civilian work with the Army after the war and was with the Air Force.

Mr. Flickinger was born in Bellefontaine, Ohio.

After his retirement, he was regional representative of Common Cause. He also was active in the UNDER organization, which counsels and helps at the Maryland House of Correction in Jessup. He was cited for his service.

Mr. Flickinger was an elder of Takoma Park Presbyterian Church. He was a member of the Traffic Club of Washington.

He is survived by his wife of more than 50 years, the former Helen Carter, of the home in Silver Spring, four daughters, Marcia Balderson, of Greenbelt, Shirley Stewart, of Palo Alto, Calif., Carol Beasley, of San Antonio, Tex., and Connie Lee Cox, of Bedford, Va., nine grandchildren and two great-grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Memorial Fund of Takoma Park Presbyterian Church or to the Heart Fund.