Otto Probst (29 December 1911 - 22 December 1978) was an Austrian political activist.
He survived the war, despite spending most of it in the Buchenwald concentration camp, followed by two years in a punishment battalion sent to support the war effort on the Russian front.
After 1945 he became a mainstream Social Democratic politician, eventually serving between 1970 and his death in 1978 as a President of the National Council ("Nationalratspräsident").