Colorado Mounted Rangers (CMR) is a 501(c)(3) nonprofit organization and former statutory state law enforcement auxiliary in the US State of Colorado. The organization served as the legal entity for the Colorado Rangers from February 1941 until In July 2018, when the Colorado Mounted Rangers ceased their operational law enforcement activities, transitioning the Colorado Rangers to a newly formed government agency named Colorado Rangers Law Enforcement Shared Reserve.

The Colorado Rangers Law Enforcement Shared Reserve (CLER), known publicly as the Colorado Rangers, is a statewide police agency in the U.S. state of Colorado. It is a statewide law enforcement reserve of sworn POST-certified peace officers who serve as force multipliers, allowing Colorado law enforcement agencies to reduce costs and manpower through a shared force. It is the only such statewide police reserve force in the United States. The Colorado Rangers have existed in some capacity since Colorado Territory's formation in 1861, though the modern agency was formed in 2017 from the Colorado Mounted Rangers.