Gunfighters, also called gunslingers (), or in the 19th and early 20th centuries gunmen, were individuals in the American Old West who gained a reputation of being dangerous with a gun and participated in gunfights and shootouts. Today, the term "gunslinger" is more or less used to denote someone who is quick on the draw with a pistol, but can also refer to riflemen and shotgun messengers. The gunfighter is also one of the most popular characters in the Western genre and has appeared in associated films, video games, and literature.

The gunfighter could be a lawman, outlaw, cowboy, or shooting exhibitionist, but was more commonly a hired gun who made a living with his weapons in the Old West.