DDY can refer to: Douglas DC-4 Skymaster, registration PH-DDY, an aircraft owned by the Dutch Dakota Association The Dudwindi railroad station in India D.D.Y. Hastanesi, a hospital in İzmir, Turkey Dennis DeYoung (born 1947), American musician Double Dare You, film production company associated with Guillermo del Toro Dirty Disco Youth, alias for German disc jockey and former Scooter member Phil Speiser