PK is a 2014 Indian Hindi-language science fiction satirical comedy drama film.
PK may also refer to:
- A magic number commonly used in the Zip file format
- The country code top level domain (ccTLD) for Pakistan
- Port knocking, a method of externally opening ports on a firewall
- Public-key cryptography
- A crane for general duty
- SQL PRIMARY KEY Constraint
- Pack, park, or peak
- PK Rosy, Malayalam cinema's first female performer