PK3 may refer to:
PK3 (file extension), a file extension in the id Tech 3 game engine PK3 Paris, a clothing brand made by French footballer Presnel Kimpembe "PK3" (song), an alternative name for the Hindi song Nanga Punga Dost in the 2014 Bollywood film PK
See also PK-3 Plus (ISS experiment), a joint Russian-German laboratory PK-35 (disambiguation) PK (disambiguation)