The Yuma Territorial Prison is a state historic site and museum located in Yuma, Arizona. The prison at the site was in operation for almost thirty-three years and incarcerated over 3,069 inmates.

The Yuma Territorial Prison is prevalent in Popular culture as it is often featured in western movies and short stories as the prison where outlaws were sent. Examples of these stories include 3:10 to Yuma, Kid Rodelo, For a Few Extra Dollars, Once Upon a Time in the West, and many others. Although regarded as a harsh prison facility, current evidence indicates the Yuma Territorial Prison was in fact a humanely administered prison with punishments limited to hard labor, dark cells, and the ball and chain for attempted escapees. Schooling was also available in the prison and as such, the prison became a model for modern correctional facilities in the state.