J31, J.31 or J-31 may refer to :

• British Aerospace Jetstream J31, a British airliner
• Nissan Teana J31, a Japanese sedan
• INS Makar (J31), 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

• 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

Topics referred to by the same term

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