2nd Cavalry, 2nd Cavalry Division, 2nd Cavalry Brigade or 2nd Cavalry Regiment may refer to:

• 2nd Cavalry Army, of the Bolshevik Red Army in the Russian Civil War

• II Cavalry Corps (Grande Armée)
• II Cavalry Corps (German Empire)

• 2nd Cavalry Division (Australia)
• 2nd Cavalry Division (Belgium)
• 2nd Light Cavalry Division (France)
• 2nd Cavalry Division (German Empire)
• 2nd Cavalry Division (Reichswehr)
• 2nd Indian Cavalry Division
• 2nd Cavalry Division Emanuele Filiberto Testa di Ferro, of the Italian Army
• 2nd Guard Cavalry division (Russian Empire)
• 2nd Cavalry Division (United Kingdom)
• 2nd Cavalry Division (United States)

• 2nd Cavalry Brigade (Australia)
• 2nd Cavalry Brigade (Hungary)
• 2nd (Sialkot) Cavalry Brigade, of the Indian Army
• 2nd Cavalry Brigade (Poland)
• 2nd Cavalry Brigade (United Kingdom)
• 2nd Brigade Combat Team, 1st Cavalry Division (United States)

• 2nd Cavalry Regiment (Australia)
• 2nd Regiment of Cavalry (Canada)
• 2nd Foreign Cavalry Regiment, of the French Foreign Legion
• 2nd Cavalry Regiment (Greece)
• 2nd Madras Cavalry, of the East India Company
• 2nd Cavalry Regiment (Portugal)
• 2nd Cavalry Regiment (United States)
• 2nd Regiment Alabama Volunteer Cavalry (Confederate), a Confederate regiment of the American Civil War
• 2nd Arkansas Cavalry Regiment (Slemons'), a Confederate regiment of the American Civil War
• 2nd Arkansas Cavalry Regiment (Union), a Union regiment of the American Civil War
• 2nd California Cavalry Regiment, a Union regiment of the American Civil War
• 2nd Colorado Cavalry Regiment, a Union regiment of the American Civil War
• 2nd Florida Cavalry Regiment (Union), a Union regiment of the American Civil War
• 2nd Regiment Indiana Cavalry, a Union regiment of the American Civil War
• 2nd Regiment Illinois Volunteer Cavalry, a Union regiment of the American Civil War
• 2nd Regiment Iowa Volunteer Cavalry, a Union regiment of the American Civil War
• 2nd Regiment Kansas Volunteer Cavalry, a Union regiment of the American Civil War
• 2nd Maryland Cavalry (Confederate), a Confederate regiment of the American Civil War
• 2nd Regiment of Cavalry, Massachusetts Volunteers, a Union regiment of the American Civil War
• 2nd Michigan Volunteer Cavalry Regiment, a Union regiment of the American Civil War
• 2nd Minnesota Volunteer Cavalry Regiment, a Union regiment of the American Civil War
• 2nd Nebraska Cavalry, a Union regiment of the American Civil War
• 2nd Ohio Cavalry, a Union regiment of the American Civil War
• 2nd Tennessee Cavalry Regiment, a Confederate regiment of the American Civil War
• 2nd Virginia Cavalry, a Confederate regiment of the American Civil War
• 2nd West Virginia Volunteer Cavalry Regiment, a Union regiment of the American Civil War
• 2nd Regiment Wisconsin Volunteer Cavalry, a Union regiment of the American Civil War