Cock may refer to:

• Rooster, a male chicken
• In ornithology, the male of any bird
• Cock, a colloquial word for a penis
• Cock of the year/school/estate, A term used in the north of England to denote the best fighter in a defined area

In valves:

• A type of tap, faucet or valve
• Steam cock, a drain valve on a steam engine cylinder
• Bibcock, a small type of valve
• Sample cock, a small valve fitted in breweries and other process industries to check the product during manufacture
• Stopcock, a valve used to restrict or isolate the flow of a liquid or gas through a pipe
• Petcock, a small valve, primarily for draining liquid or releasing pressure from a vessel
• Ballcock, a mechanism for filling water tanks

In clocks:

• A part of a clock or watch used to support an outrigger bearing for a gear or lever
• Balance cock, supports the balance wheel in a watch
• Fly cock, supports the fly on a bracket clock
• Back cock, supports the pendulum and pallet arbor

In other:

• To cock, to prepare the hammer of a firearm for firing
• Shuttlecock, a high-drag projectile used in the sport of badminton
• Cock, the NATO reporting name of the Antonov An-22
• A Cocktail, a style of mixed drink

See also:

• Cock (surname)
• Cocks (surname)
• Cockpit, the area usually nearer the front of a piloted aircraft from which a pilot controls the aircraft.
• Caulk, a homophone in some North American dialects of English
• Woodcock (disambiguation)