J33

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