X-15 (disambiguation)
X-15 stands for:
- North American X-15 , experimental rocket-propelled aircraft for high-altitude and high-speed flights
- X-15 (German title: The X-15 ready to go ), American science fiction film by Richard Donner from 1961
- X-15 (Band) , American rock band from Bellingham, Washington
- X-15 , name of a flamethrower