2nd Cavalry
- 2nd (Sialkot) Cavalry Brigade
- 2nd Arkansas Cavalry Regiment (Slemons')
- 2nd Arkansas Cavalry Regiment (Union)
- 2nd Brigade Combat Team, 1st Cavalry Division (United States)
- 2nd California Cavalry Regiment
- 2nd Cavalry Army
- 2nd Cavalry Brigade (Australia)
- 2nd Cavalry Brigade (Hungary)
- 2nd Cavalry Brigade (Poland)
- 2nd Cavalry Brigade (United Kingdom)
- 2nd Cavalry Division (Australia)
- 2nd Cavalry Division (Belgium)
- 2nd Cavalry Division (German Empire)
- 2nd Cavalry Division (Reichswehr)
- 2nd Cavalry Division (United Kingdom)
- 2nd Cavalry Division (United States)
- 2nd Cavalry Division Emanuele Filiberto Testa di Ferro
- 2nd Cavalry Regiment (Australia)
- 2nd Cavalry Regiment (Greece)
- 2nd Cavalry Regiment (Portugal)
- 2nd Cavalry Regiment (United States)
- 2nd Colorado Cavalry Regiment
- 2nd Florida Cavalry Regiment (Union)
- 2nd Foreign Cavalry Regiment
- 2nd Guard Cavalry division (Russian Empire)
- 2nd Indian Cavalry Division
- 2nd Light Cavalry Division (France)
- 2nd Madras Cavalry
- 2nd Maryland Cavalry (Confederate)
- 2nd Michigan Volunteer Cavalry Regiment
- 2nd Minnesota Volunteer Cavalry Regiment
- 2nd Nebraska Cavalry
- 2nd Ohio Cavalry
- 2nd Regiment Alabama Volunteer Cavalry (Confederate)
- 2nd Regiment Illinois Volunteer Cavalry
- 2nd Regiment Indiana Cavalry
- 2nd Regiment Iowa Volunteer Cavalry
- 2nd Regiment Kansas Volunteer Cavalry
- 2nd Regiment Wisconsin Volunteer Cavalry
- 2nd Regiment of Cavalry (Canada)
- 2nd Regiment of Cavalry, Massachusetts Volunteers
- 2nd Tennessee (Barteau's) Cavalry Regiment
- 2nd Virginia Cavalry
- 2nd West Virginia Volunteer Cavalry Regiment
- II Cavalry Corps (German Empire)
- II Cavalry Corps (Grande Armée)