Crank may refer to:

As a technical term:

• Crankshaft, the part of a piston engine which translates reciprocating linear piston motion into rotation
• Crankset, the component of a bicycle drivetrain that converts the reciprocating motion of the rider's legs into rotational motion used to drive the chain, which in turn drives the rear wheel
• Crank (mechanism), in mechanical engineering, a bent portion of an axle, or shaft, or an arm keyed at right angles to the end of a shaft, by which motion is imparted to or received from it
• in mathematics, used to explain congruence patterns in integer partitions, as coined by Freeman Dyson

As a colloquial term:

• Crank (person), a person who holds unorthodox opinions, but is alleged to have false or ludicrous beliefs
• Several recreational drugs, including amphetamine and methamphetamine

In entertainment and media:

• Crank (film), a 2006 film starring Jason Statham
• Crank! (magazine), a science fiction fanzine edited by Bryan Cholfin
• Crank! (record company), a record label that released albums by emo bands Mineral, The Gloria Record, and Bright Eyes

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