Don't Be a Sucker! is a short educational film produced by the U.S. War Department in 1943 and re-released in 1947. The film depicts the rise of Nazism in Germany and warns Americans against repeating the mistakes of intolerance made in Nazi Germany.

It emphasizes that Americans will lose their country if they let themselves be turned into "suckers" by the forces of fanaticism and hatred. The film was made to make the case for the desegregation of the United States armed forces by simply revealing the connection between prejudice and fascism.