The Maverick Queen is a 1956 American Western and starring Barbara Stanwyck as the title character and Barry Sullivan as an undercover Pinkerton detective out to stop outlaws Butch Cassidy, the Sundance Kid, and the Wild Bunch.

A stranger, calling himself Jeff Young, imposes on rancher Lucy Lee for a meal and a night's rest, then saves her from being robbed.

Jeff helps deliver her cattle to town, where he encounters Kit Banion running her saloon, The Maverick Queen.

Kit is secretly in cahoots with the notorious Hole in the Wall Gang, led by Butch Cassidy and Sundance, and a jealous Sundance is angered when Jeff beats him at poker and attracts romantic interest from Kit, who offers Jeff a job as a faro dealer.

The posse arrives, whereupon Jeff confesses that he is actually a Pinkerton detective, working undercover to catch the thieves.