J33 may refer to: Allison J33, a turbojet engine de Havilland J 33 Venom, a British fighter in service with the Swedish Air Force Ground Equipment Facility J-33, a former radar station in California LNER Class J33, a British steam locomotive class Malaysia Federal Route J33 Nasal polyp Pentagonal gyrocupolarotunda, a Johnson solid (J33) Small nucleolar RNA J33