4th Cavalry
- 1st Indian Cavalry Division
- 4th (Lucknow) Cavalry Brigade
- 4th (Meerut) Cavalry Brigade
- 4th (Secunderabad) Cavalry Brigade
- 4th Arkansas Cavalry Regiment (Confederate)
- 4th Arkansas Cavalry Regiment (Union)
- 4th Cavalry (India)
- 4th Cavalry (Pakistan)
- 4th Cavalry Brigade (Australia)
- 4th Cavalry Brigade (Imperial Japanese Army)
- 4th Cavalry Brigade (Poland)
- 4th Cavalry Brigade (United Kingdom)
- 4th Cavalry Brigade (United States)
- 4th Cavalry Corps (Soviet Union)
- 4th Cavalry Division (German Empire)
- 4th Cavalry Division (India)
- 4th Cavalry Regiment (Australia)
- 4th Cavalry Regiment (United States)
- 4th Iowa Cavalry Regiment
- 4th Kentucky Cavalry Regiment (Union)
- 4th Light Cavalry Division (France)
- 4th Michigan Cavalry Regiment
- 4th Ohio Cavalry Regiment
- 4th Pennsylvania Cavalry Regiment
- 4th South Carolina Cavalry Regiment
- 4th United States Colored Cavalry Regiment
- 4th Virginia Cavalry Regiment
- IV Cavalry Corps (German Empire)
- IV Cavalry Corps (Grande Armée)