The 4th Cavalry Brigade is an AC/RC unit based at Fort Knox, Kentucky.

The unit was formerly designated as 4th Brigade, 85th Division.

The brigade is a subordinate unit of the 1st Army.

The unit is composed of: [2] Constituted 25 August 1942 in the Army of the United States as Headquarters, 4th Tank Destroyer Group Activated 1 September 1942 at Camp Hood, Texas Inactivated 26 October 1945 at Fort Jackson, South Carolina Disbanded 5 August 1952 Reconstituted 24 October 1997 in the Regular Army as Headquarters, 4th Cavalry Brigade, and activated at Fort Knox, Kentucky Inactivated 16 October 1999 at Fort Knox, Kentucky Activated 1 December 2006 at Fort Knox, Kentucky This article incorporates public domain material from Lineage & Honors for 4th Cavalry Brigade.

United States Army Center of Military History.