First Regiment of Texas Mounted Rifle Volunteers

First Regiment of Texas Mounted Rifle Volunteers
Active	June 1846 – October 1846
Country	United States
Allegiance	United States Army
Branch	Cavalry
Type	Light Cavalry
Role	Reconnaissance Counterinsurgency Field Intelligence
Size	10 companies
Engagements	Mexican–American War Battle of Monterrey
Commanders
Notable commanders	Colonel John Coffee Hays

First Regiment of Texas Mounted Rifle Volunteers, unofficially known as Hays's Texas Rangers, was a United States Volunteer regiment raised in June 1846, with a core of Texas Rangers, for service in the Mexican–American War. The regiment distinguished itself at the Battle of Monterrey. It was disbanded with the end of active operations in September the same year.