David Daniel "Mickey" Marcus (22 February 1901 – 10 June 1948) was a United States Army colonel who assisted Israel during the 1948 Arab–Israeli War, and who became Israel's first modern general (Hebrew: Aluf).
He was killed by friendly fire, when he was mistaken for an enemy infiltrator while returning to Israeli positions at night.
Marcus is one of the well known Israeli Machal soldiers.
He was portrayed by Kirk Douglas in the 1966 Hollywood movie Cast a Giant Shadow.