Fuck is an obscene English language word, which refers to the act of sexual intercourse and is also commonly used as an intensifier or to denote disdain. Its origin is obscure but is usually considered to be first attested to around 1475, although it may be considerably older. In modern usage, the term fuck and its derivatives (such as fucker and fucking) can be used as a noun, a verb, an adjective, an interjection, or an adverb. There are many common phrases that employ the word, as well as compounds that incorporate it, such as motherfucker and .

Johann Wilhelm Fück (born in Frankfurt am Main; died in Halle) was a German Orientalist.

Karl Wilhelm Gottlieb Leopold Fuckel (3 February 1821, Reichelsheim – 8 May 1876) was a German botanist who worked largely on fungi.

L-fuculokinase is an enzyme that catalyzes the chemical reaction