The rules of golf are a standard set of regulations and procedures by which the sport of golf should be played. They are jointly written and administered by the R&A (spun off from The Royal and Ancient Golf Club of St Andrews) the governing body of golf worldwide except in the United States and Mexico, which are the responsibility of the United States Golf Association (USGA). The rule book, entitled "Rules of Golf", is published on a regular basis and also includes rules governing amateur status.

A central principle, although not one of the numbered rules, is found in the R&A rule book's inside front cover:

In addition to the rules golf adheres to a code of conduct, known as etiquette, which generally means playing the game with due respect for the golf course and other players. Etiquette is often seen as being as important to the sport as the rules themselves.

Before the rules of golf were standardised golf clubs commonly had their own set of rules, which while broadly the same had subtle differences, such as allowing for the removal of loose impediments, e.g. leaves and small stones. In the late 19th century, most clubs began to align themselves with either the Society of St. Andrews Golfers, later the R&A, or the Gentlemen Golfers of Leith, later the Honourable Company of Edinburgh Golfers.