Irvin Lechliter, 68, a retired lawyer who had been in both private practice and government service, died March 10 at his home in Washington after a long illness.

From 1958 until 1960, he was national executive director of the American Veterans Committee. In 1961, he was appointed assistant director of the President's Commission on Campaign Costs.

Mr. Lechliter then was in private law practice for 10 years. He had been in semiretirement since 1970.

Born in Auburn, Neb., he was a graduate of the University of Nebraska and of George Washington University Law School.

He came here in 1936 to work in the law library of the Library of Congress. From 1938 to 1941, he was chief administrative attorney of the marketing laws survey, Works Progress Administration.

He then served as an attorney with the Federal Trade Commission and the War Relocation Authority, serving in Idaho and California. After a year with the Army, he was an area attorney with the Public Housing Administration in Seattle and San Francisco from 1945 to 1949.

Mr. Lechliter then went to Lima, Peru, for two years as regional counsel for the Institute of Inter-American Affairs.

He returned to Washington in 1951, and was with the Technical Cooperation Administration of the Senate Department. From 1953 to 1956, he was legal counsel of the Latin American division of Braniff International Airways.

After two years in private practice, Mr. Lechliter served for a short period as administrative officer of the Committee for International Economic Growth.

He is survived by two sons, John and Stephen, and a doghter, Mary, all of Washington, and a brother, Verne, of Cheyenne, Wyo.