Colorado Territorial Correctional Facility (CTCF), colloquially known simply as "Territorial," is a medium security prison in Cañon City, Colorado. CTCF is the oldest prison in the Colorado DOC system. It was built in 1871 as a territorial prison and became a state prison in 1876. The Colorado DOC system only has two infirmaries, one of which is located in CTCF. The other is located in the Denver Reception & Diagnostic Center (DRDC).^{[citation needed]}

From the 1890s until 1993, the Colorado death row and execution chamber was located at the Colorado Territorial Correctional Facility,^[1][2] but the last execution to take place there was in 1967.^[3] In 1993, the Colorado State Penitentiary opened, and death row moved there. As of 2012, the Sterling Correctional Facility housed Colorado's death row prisoners.^[1] Capital punishment was abolished in Colorado in 2020; although the law did not apply retroactively, the sentences of the three remaining inmates on death row were commuted to life in prison by governor Jared Polis.^[4]

• Canon City (film), a 1948 film about a 1947 prison break at the facility