Denis Sefton Delmer (born 24 May 1904, Berlin, Germany – died 4 September 1979, Lamarsh, Essex) was a British journalist and propagandist for the British government. Fluent in German, he became friendly with Ernst Röhm who arranged for him to interview Adolf Hitler in the 1930s. During the Second World War he led a black propaganda campaign against Hitler by radio from England and he was named in the Nazis' Black Book for immediate arrest after their invasion of England.