William Christopher (Doey) Rein, 70, a retired official of the Central Intelligence Agency and a retired colonel in the Army Reserves, died Monday at Arlington Hospital. He had a neurological disorder.

Dr. Rein was born in Baltimore and graduated from the McDonogh School and Western Maryland College. From 1932 to 1936, he was a teacher in Cumberland, Md. He then went to Duke University, where he earned a doctorate in statistics and educational psychology in 1941.

In that year, he entered the Army for World War II service.He was STATIONED IN washington, Alabama and Kentucky. Among his assignments was supervision of the Army Service Forces School Training and the Army Specialized Training Program.He received the Legion of Merit. Dr. Rein retired from the Reserves in 1956 with the rank of colonel.

After the war, Dr. Rein, who had made his home in Arlington since 1941, worked for the Veterans Administration. He joined the CIA in 1951 and remained there as a training officer and liaison officer with the Defense Department until his retirement in 1971.

Dr. Rein was a member of St. Mary's Episcopal Church and then of St. Andrew's Episcopal Church in Arlington. He was a vestryman and treasurer of both churches.

Survivors include his wife, the former Isabel Douglas, to whom he was married for 50 years, of Arlington; one son, Mac, of Bethesda; one daughter, Ellen Rein of Syracuse, N.Y.; one brother, Howard E. Rein of Baltimore, and three grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Memorial Fund, St. Andrew's Episcopal Church, Arlington, Va. CAPTION: