Frederick N. Leonard, 70, a retired information officer with the federal government, died of cancer Tuesday at Memorial Hospital in Easton, Md.

He had lived in Oxford, Md., since 1949, commuting to his position with the Central Intelligence Agency in Washington until his retirement in 1957.

Mr. Leonard went on active duty with the U.S. Army in 1940. He served in Washington and then in Europe during World War II, retiring with the rank of colonel at the end of the war.

He then became a civilian employe with the old War Department and later with the Army and was chief of the information control branch of the Office of the U.S. Military Government in Berlin until 1949. He was in charge in media, publications and many cultural matters.

Mr. Leonard was born in Morris Plains, N.J. He graduated from Groton School and in 1932 from Princeton University. He studied at Jesus College at Cambridge University in England. He also studied Spanish in Peru.

A post board member of the Talbot County (Md.) Academy of Arts and the Talbot County Free Library, Mr. Leonard was a former vestryman of the Old Wye Episcopal Parish in Wye Mills, Md. He belonged to the Talbot County Historical Society and the Chesapeake Bay Yacht Club.

He is survived by his wife, the former Phyllis Hurst, of Oxford, and a brother, Thomas D. Jr., of Southampton, L.I., N.Y.