Gustav Simon (2 August 1900– 18 December 1945) was a Nazi Party official who served as Gauleiter of Gau Moselland from 1931 to 1945 and, from 1940 until 1942, as Chief of Civil Administration in occupied Luxembourg. In this position, he was chiefly responsible for the Holocaust in Luxembourg. After the end of the Second World War, Simon was arrested and died in custody but the circumstances of his death are disputed.