Other
- P.K, Iranian automobile
- Package (disambiguation), as a shortform
- Paperinik, cartoon character
- Philosopher king, the hypothetical Guardians of Plato's utopia Kallipolis
- Public Knowledge
- PK machine gun, a Soviet weapon, abbreviated from Pulemyot Kalashnikova (Kalashnikov machine gun)
- Point kilométrique, a French distance-measurement acronym
- Purple Kush, a strain of extremely potent marijuana
- Preacher's kid, a child of a pastor
- PK Gum, a brand of chewing gum marketed in Australia and New Zealand by the Wrigley Company
- SAS President Kruger (F150), a former ship of the South African Navy
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