The Pendleton Round-Up is a major annual rodeo in the northwestern United States, at Pendleton in northeastern Oregon. Held at the Pendleton Round-Up Stadium during the second full week of September each year since 1910, the rodeo brings roughly 50,000 people every year to the city. The Pendleton Round-Up is a member of the Professional Rodeo Cowboys Association (PRCA). The ProRodeo Hall of Fame in Colorado Springs, Colorado, inducted the Pendleton Round-Up in 2008.

Rodeo is a competitive equestrian sport that arose out of the working practices of cattle herding in Spain and Mexico, expanding throughout the Americas and to other nations. It was originally based on the skills required of the working vaqueros and later, cowboys, in what today is the western United States, western Canada, and northern Mexico. Today, it is a sporting event that involves horses and other livestock, designed to test the skill and speed of the cowboys and cowgirls. American-style professional rodeos generally comprise the following events: tie-down roping, team roping, steer wrestling, Steer roping, saddle bronc riding, bareback bronc riding, bull riding and barrel racing. The events are divided into two basic categories: the rough stock events and the timed events. Depending on sanctioning organization and region, other events such as breakaway roping, goat tying, and pole bending may also be a part of some rodeos. The "world's first public cowboy contest" was held on July 4, 1883, in Pecos, Texas, between cattle driver Trav Windham and roper Morg Livingston.