J13

J13 may refer to:

Roads

 * County Route J13 (California)
 * Johor State Route J13, in Malaysia

Vehicles

 * GNR Class J13, a British steam locomotive class
 * HSWMS Hälsingborg, a Visby-class destroyer of the Swedish Navy
 * Shenyang J-13, a cancelled Chinese light fighter aircraft

Other uses

 * Bacterial pneumonia
 * Pentagonal bipyramid, a Johnson solid (J13)
 * J13, a Nissan J engine