The Unified Boxing Rules, also referred to as the Unified Rules of Boxing, provide a common regulatory framework for professional boxing contests approved by the Association of Boxing Commissions (ABC). They provide a common regulatory framework for professional boxing contests, including round duration, scoring, the authority of the referee, knockdown procedures, fouls, accidental injuries, and procedures for boxers who leave the ring during a bout.

The rules are used as a model by athletic commissions and other regulatory authorities. They do not constitute a single worldwide code for professional boxing, which remains regulated by local commissions, sanctioning bodies, and national or regional regulatory frameworks.

The Unified Boxing Rules were approved by the Association of Boxing Commissions on August 25, 2001. The ABC later amended the rules on August 2, 2002, July 3, 2008, July 24, 2012, July 29, 2014, and August 3, 2016.^[1]

Before the adoption of the Unified Boxing Rules, professional boxing in the United States was regulated primarily by state and tribal athletic commissions, with championship bouts also subject to the rules of sanctioning bodies such as the WBC, WBA, IBF and WBO. Federal legislation, including the Professional Boxing Safety Act of 1996, established minimum health and safety standards but did not create a single national fight-rule code.^[2][3][4]

The creation of the Unified Boxing Rules reflected efforts by athletic commissions to standardize professional boxing regulation in the United States. The rules have been widely adopted by state commissions in the United States, but their application depends on adoption or use by the relevant commission or sanctioning authority.^[5][6] Other jurisdictions may impose their own professional boxing rules or regulatory frameworks, such as those of the British Boxing Board of Control (BBBofC).^[7][8]

The ABC maintains unified rules documents for several combat sports, including boxing, mixed martial arts (MMA), kickboxing, Muay Thai, and bare-knuckle fighting. In boxing, the unified rules address recurring regulatory questions such as scoring, the referee's authority, the treatment of knockdowns, accidental fouls, intentional fouls, and the circumstances under which a bout may be stopped or changed to a decision.^[9]

The Unified Boxing Rules cover the basic conduct of professional boxing contests, including the length of rounds, judging, scoring, knockdowns, fouls, injuries, and stoppages.^[1]

Under the rules, each round is three minutes long, with a one-minute rest period between rounds. Bouts are scored by three judges, and the 10 Point Must System is the standard scoring system. The referee is the sole arbiter of a bout and is the only person authorized to stop a contest, subject to any review procedures available under the applicable regulatory authority.

Judges score each round using the 10-point must system. Rounds are evaluated according to criteria including clean punching, effective aggressiveness, ring generalship, and defense. The winner of a round generally receives ten points, while the opponent receives a lower score depending on the judges' assessment and any knockdowns or point deductions.

A boxer is considered knocked down when a legal punch causes any part of the body other than the feet to touch the ring floor, when the boxer is held up by the ropes, or when the boxer is hanging on, through, or over the ropes without the ability to protect themself. When a boxer is knocked down, the referee begins a count and the opponent is directed to a neutral corner.

The rules also address situations in which a boxer is knocked out of the ring. A boxer who is knocked out of the ring receives a 20-second count and must return to the ring without assistance. Assistance from spectators or seconds may lead to a point deduction or disqualification, at the referee's discretion.

The rules list prohibited actions, including hitting below the belt, hitting an opponent who is down, holding and hitting, butting with the head, using elbows or forearms, wrestling or rough tactics, kidney punches, rabbit punches, and intentionally spitting out the mouthpiece. The referee may issue warnings, deduct points, or disqualify a boxer depending on the severity and intentionality of the foul.

The rules distinguish between injuries caused by legal blows, intentional fouls, and accidental fouls. If a boxer is injured by a legal blow and cannot continue, the opponent wins by technical knockout. If an intentional foul causes an injury severe enough to stop the bout, the fouling boxer may lose by disqualification. If an accidental foul causes the bout to be stopped before a specified number of rounds have been completed, the result may be a no decision; if the required number of rounds has been completed, the bout may go to the judges' scorecards.

If a boxer's mouthpiece is dislodged, the referee may call time and have it replaced at an appropriate moment. If the referee determines that a boxer intentionally spits out the mouthpiece, the boxer may receive a warning or point deduction.