J15

J15 may refer to:

Aircraft

 * Junkers J 15, a German experimental aircraft
 * Shenyang J-15, a Chinese carrier-based jet fighter

Locomotives

 * GSR Class J15, an Irish steam locomotive
 * LNER Class J15, an English steam locomotive class

Ships

 * INS Investigator, a Sandhayak-class survey ship of the Indian Navy

Other uses

 * Bacterial pneumonia
 * County Route J15 (California), a County route in Tulare County, California
 * Elongated square bipyramid, a Johnson solid (J15)
 * J15, a Nissan J engine model