PT4 or ''variant'' may refer to:
*
New Horizons PT4
(internally designated in the context of the Hubble Space Telescope, and 7 in the context of the ''New Horizons'' mission) is a cold classical Kuiper belt object (KBO) and was formerly a potential flyby target for the ''New Horizons'' probe. ...
, aka 2014 MT69, a celestial object.
*
PT-4, a pre-World War II US Navy PT-boat.
* ''
Prison Tycoon 4: Supermax'' (2008 videogame)
*
PT4, a paratriathlon classification.
{{Letter-Number Combination Disambiguation