PK or pk may refer to:
The PK (Russian: Пулемёт Калашникова, transliterated as Pulemyot Kalashnikova, or "Kalashnikov's Machinegun"), is a 7.62 mm general-purpose machine gun designed in the Soviet Union and currently in production in Russia.
Perbadanan Kemajuan Negeri Selangor Football Club (English: Selangor State Development Corporation Football Club) or popularly known as PKNS FC is a Malaysian football club based in Petaling Jaya, Selangor.
PK Carsport is a racing team currently competing in the NASCAR Whelen Euro Series, Belcar Trophy among other series.
Protein kinase C alpha (PKCα) is an enzyme that in humans is encoded by the PRKCA gene.
PKP Cargo (WSE: PKP) is a logistics operator and a part of the PKP Group in Poland. It is the largest railway freightcarrier in Poland and second largest in the European Union.
Pyruvate kinase isozymes M1/M2 (PKM1/M2), also known as pyruvate kinase muscle isozyme (PKM), pyruvate kinase type K, cytosolic thyroid hormone-binding protein (CTHBP), thyroid hormone-binding protein 1 (THBP1), or opa-interacting protein 3 (OIP3), is an enzyme that in humans is encoded by the PKM2 gene.
PKZIP is a file archiving computer program, notable for introducing the popular ZIP file format. PKZIP was first introduced for MS-DOS on the IBM-PC compatible platform in 1989. Since then versions have been released for a number of other architectures and operating systems.
PKWARE, Inc. is an enterprise software company founded in 1986, by Phil Katz, co-inventor of the ZIP standard.