The 3rd Cavalry Regiment, formerly 3rd Armored Cavalry Regiment ("Brave Rifles") is a regiment of the United States Army currently stationed at Fort Cavazos, Texas.

The regiment has a history in the United States Army that dates back to 19 May 1846, when it was constituted in the Regular Army as the Regiment of Mounted Riflemen at Jefferson Barracks, Missouri. This unit was reorganized at the start of the American Civil War as the 3rd U.S. Cavalry Regiment on 3 August 1861. In January 1943, the regiment was re-designated as the 3rd Cavalry Group (Mechanized). Today they are equipped with Stryker vehicles. The 3rd Armored Cavalry Regiment was the last heavy armored cavalry regiment in the U.S. Army until it officially became a Stryker regiment on 16 November 2011. It will retain its lineage as the 3rd Cavalry Regiment.