Henry Alexander Davidson (May 27, 1905 – August 23, 1973) was an American physician, a psychiatric administrator, and a proponent of forensic psychiatry.
He interned at Beth Israel Medical Center in Newark, New Jersey from 1928 to 1929, and was a resident at the Philadelphia Orthopedic Hospital and Infirmary for Nervous Diseases from 1931 to 1932.
With the start of World War II, he entered military service in 1941 and served in the South Pacific.
He entered the civil service at the Veterans Administration in Newark and worked at the central office in Washington, DC from 1950 to 1954.
He died at his home, 276 Prospect Street in East Orange, New Jersey on August 23, 1973, of coronary thrombosis.