The official maximum length of a golf club is 48 inches according to the rules set by the USGA (United States Golf Association). This length applies to any club used during play, including drivers, irons, and putters. The standard maximum length helps maintain fairness and consistency among players, ensuring that no single player has an unfair advantage due to equipment length. Golfers often choose club lengths based on their height and playing style, but they must comply with these regulations to compete officially.