Retired Army Lt. Col. Osborn Amos Kinzer, 76, who served in both a military and civilian capacity as an Army engineer, died of cancer Saturday at Walter Reed Army Medical Center.

At the time of his retirement from military service in 1963, he was on duty at Fort Belvoir. He remained there as a civilian, working with Army mobility equipment in the Research and Development Center and then with the Institute of Land Combat of the Army Developments Command. He retired for a second time in 1973.

Col. Kinzer was born in the Philippine Islands, where his father was an Army surgeon. He graduated from purdue University and was a licensed professional engineer.

He worked for several private firms in Oklahoma and Texas prior to World War II, when he entered the Corps of Engineers, serving in Oklahoma and Texas. He was with the office of the chief of engineers in Washington from 1944 to 1946, and after three years of duty in Panama, returned to that office in 1949-52. He later served in Okinawa.

Col. Kinzer had received the Army Department's outstanding performance rating. He was a member of the National Society of Professional Engineers and the American Society of Heating and Ventilating Engineers.

He is survived by his wife, the former LaBerta Mason, of the home in Alexandria; four children, Edward M., of Akron, Ohio, John O. and Frederick S., both of Alexandria, and William Allen, of Jefferson City, Mo.; his mother, Ellen F. Osborn, and a sister, Dorothy Thompson, both of Los Angeles and two grandchildren.