The Marquess of Queensberry rules are a code of popularly accepted rules in the sport of boxing. They were named so because John Sholto Douglas, 9th Marquess of Queensberry publicly endorsed the code.

The boxing code was written by John Graham Chambers in 1865 and published in 1867 as "the Queensberry rules for the sport of boxing". This code of rules superseded the Revised London Prize Ring rules (1853), which had themselves replaced the original London Prize Ring rules (1743) of Jack Broughton . This version persuaded boxers that "you must not fight simply to win; no holds barred is not the way; you must win by the rules" (17, sect. 5, pt. 1).

The first prize fight under Marquess of Queensberry rules took place in Cincinnati, Ohio August 29th 1885. John L. Sullivan defeated his opponent, Dominick McCaffery in the sixth round.

Marquess of Queensbury Rules

1. To be a fair stand-up boxing match in a 24-foot ring, or as near that size as practicable.
2. No wrestling or hugging allowed.
3. The rounds to be of three minutes' duration, and one minute's time between rounds.
4. If either man falls through weakness or otherwise, he must get up unassisted, 10 seconds to be allowed him to do so, the other man meanwhile to return to his corner, and when the fallen man is on his legs the round is to be resumed and continued until the three minutes have expired. If one man fails to come to the scratch in the 10 seconds allowed, it shall be in the power of the referee to give his award in favour of the other man.
5. A man hanging on the ropes in a helpless state, with his toes off the ground, shall be considered down.
6. No seconds or any other person to be allowed in the ring during the rounds.
7. Should the contest be stopped by any unavoidable interference, the referee to name the time and place as soon as possible for finishing the contest; so that the match must be won and lost, unless the backers of both men agree to draw the stakes.
8. The gloves to be fair-sized boxing gloves of the best quality and new.
9. Should a glove burst, or come off, it must be replaced to the referee's satisfaction.
10. A man on one knee is considered down and if struck is entitled to the stakes.
11. No shoes or boots with springs allowed.
12. The contest in all other respects to be governed by revised rules of the London Prize Ring.

Sources

• HickokSports.com - Sports History - Boxing: Heavyweight Champions