A gentlemen's club is a private social club of a type originally set up by men from Britain's upper classes in the 18th and succeeding centuries.

A social club may be a group of people or the place where they meet, generally formed around a common interest, occupation or activity. Examples include book discussion clubs, chess clubs, country clubs, final clubs, fishing clubs, gaming clubs, women's clubs, gentlemen's clubs, hunting clubs, military officers' clubs, political clubs, religious clubs, science clubs and university clubs. The term can also refer to a criminal headquarters, such as the Ravenite Social Club or the Cage.