The 9th Cavalry Regiment is a parent cavalry regiment of the United States Army. Historically, it was one of the Army's four segregated African-American regiments and was part of what was known as the Buffalo Soldiers. The regiment saw combat during the Indian and Spanish–American Wars. During Westward Expansion, the regiment provided escort for the early western settlers and maintained peace on the American frontier.

As of 2019, the 1st Battalion and 4th Squadron serve with the 2nd Brigade Combat Team, 1st Cavalry Division as a combined arms battalion and an armored reconnaissance squadron, while the 6th Squadron is the armored reconnaissance squadron of the 3rd Brigade Combat Team of the division. All three units are stationed at Fort Cavazos.