El nocaut, KO (pronunciado /káo/), noqueo o knock-out (inglés: knockout) es una de las formas de obtener el triunfo en muchos deportes de contacto pleno, como son el boxeo, el kick boxing o el muay thai, así como en otros deportes de contacto físico directo entre ambos contendientes. El término significa fuera de combate, y se produce cuando un deportista queda incapacitado para levantarse de la lona del cuadrilátero o del tatami por un período específico de tiempo, ya sea por causa de la fatiga y o porque los daños que ha sufrido (como un corte en la ceja, o un golpe muy fuerte en la cabeza o el hígado) le inducen una pérdida del equilibrio y posteriormente la pérdida de la consciencia. Un nocaut técnico (también llamado «TKO» o «KO técnico») se declara cuando el árbitro decide que un luchador no puede continuar en el combate, pues se encuentra en condiciones inferiores a las de su oponente, aunque no haya caído a la lona. En el Reino Unido los nocauts técnicos también se producen cuando el contendiente rechaza seguir peleando o hay una irrupción del entrenador en el ring.

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A knockout (abbreviated to KO or K.O.) is a fight-ending, winning criterion in several full-contact combat sports, such as boxing, kickboxing, muay thai, mixed martial arts, karate, some forms of taekwondo and other sports involving striking. A full knockout is considered any legal strike or combination thereof that renders an opponent unable to continue fighting. The term is often associated with a sudden traumatic loss of consciousness caused by a physical blow. Single powerful blows to the head (particularly the jawline and temple) can produce a cerebral concussion or a carotid sinus reflex with syncope and cause a sudden, dramatic KO. Body blows, particularly the liver punch, can cause progressive, debilitating pain that can also result in a KO. In boxing and kickboxing, a knockout is usually awarded when one participant falls to the canvas and is unable to rise to their feet within a specified period of time, typically because of exhaustion, pain, disorientation, or unconsciousness. For example, if a boxer is knocked down and is unable to continue the fight within a ten-second count, they are counted as having been knocked out and their opponent is awarded the KO victory. In mixed martial arts (MMA) competitions, no time count is given after a knockdown, as the sport allows submission grappling as well as ground and pound. If a fighter loses consciousness ("goes limp") as a result of legal strikes it is declared a KO. Even if the fighter loses consciousness for a brief moment and wakes up again to continue to fight, the fight is stopped and declared a KO. As many MMA fights can take place on the mat rather than standing, it is possible to score a KO via ground and pound, a common victory for grapplers.

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