Bartholemew William Barclay "Bat" Masterson was a U.S. Army scout, lawman, professional gambler, and journalist known for his exploits in the late 19th and early 20th-century American Old West. He was born to a working-class Irish family in Quebec, but he moved to the Western frontier as a young man and quickly distinguished himself as a buffalo hunter, civilian scout, and Indian fighter on the Great Plains. He later earned fame as a gunfighter and sheriff in Dodge City, Kansas, during which time he was involved in several notable shootouts.

Gunfighters, also called gunslingers, or in the late 19th and early 20th century, gunmen were individuals in the American Old West who gained a reputation of being dangerous with a gun and participated in shootouts. Today, the term "gunslinger" is more or less used to denote someone who is quick on the draw with a handgun, but this can also refer to those armed with rifles and shotguns. The gunfighter is also one of the most popular characters in the Western genre and has appeared in associated films, television shows, video games, and literature.