Communist Party of Kampuchea, commonly known as the Khmer Rouge

Central Park in New York City

Cabbage Patch Kids

Church of the Province of Kenya, a former name for the Anglican Church of Kenya

Creatine kinase, as an abbreviation for an alternate name of the enzyme, "creatine phosphokinase"

C_pk, a measure of process capability

California Pizza Kitchen

Chesapeake Utilities (New York Stock Exchange symbol)

"C.P.K." (Crazy Poway Kids), a 1995 song by Unwritten Law from their album Blue Room

Carpenders Park railway station, England (National Rail station code)

CPK coloring, a way to color atoms when visualizing molecular models