PT5 or variants may refer to:
- Pratt & Whitney PT5 a turboprop engine variant of the J57 turbojet engine, given the military designation T57.
- Consolidated XPT-5, an experimental variant of the PT-3 training airplane.
- PT-5, a pre-World War II US Navy PT-boat.
- PT5, a paratriathlon classification.
- Prison Tycoon: Alcatraz (2010 videogame), 5th game in the Prison Tycoon series.
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