J31

J31, J.31 or J-31 may refer to :

Vehicles

 * British Aerospace Jetstream J31, a British airliner
 * Nissan Teana J31, a Japanese sedan
 * INS Makar, a Makar-class survey ship of the Indian Navy
 * Shenyang J-31, a Chinese fighter jet
 * LNER Class J31, a class of British steam locomotives

Other uses

 * General Electric J31, an American jet engine
 * Ground Equipment Facility J-31, a former radar station in California
 * Malaysia Federal Route J31
 * Pentagonal gyrobicupola, a Johnson solid (J31)
 * Rhinitis