J13 may refer to:
Roads
edit- County Route J13 (California)
- Johor State Route J13, in Malaysia
Vehicles
edit- GNR Class J13, a British steam locomotive class
- HSwMS Hälsingborg (J13), a Visby-class destroyer of the Swedish Navy
- Shenyang J-13, a cancelled Chinese light fighter aircraft
Other uses
edit- Bacterial pneumonia
- Pentagonal bipyramid, a Johnson solid (J13)
- J13, a Nissan J engine