3rd Cavalry

• 3d Armored Cavalry Squadron (South Vietnam)
• 3rd (Ambala) Cavalry Brigade
• 3rd (Meerut) Cavalry Brigade
• 3rd Arkansas Cavalry
• 3rd Arkansas Cavalry Regiment
• 3rd Arkansas Cavalry Regiment (Union)
• 3rd Bengal Cavalry
• 3rd Bengal Light Cavalry
• 3rd Brigade Combat Team, 1st Cavalry Division (United States)
• 3rd Cavalry (India)
• 3rd Cavalry Brigade (Australia)
• 3rd Cavalry Brigade (Imperial Japanese Army)
• 3rd Cavalry Brigade (Poland)
• 3rd Cavalry Brigade (United Kingdom)
• 3rd Cavalry Division (German Empire)
• 3rd Cavalry Division (Reichswehr)
• 3rd Cavalry Division (United Kingdom)
• 3rd Cavalry Division (United States)
• 3rd Cavalry Division Amedeo Duca d'Aosta
• 3rd Cavalry Regiment (Australia)
• 3rd Cavalry Regiment (United States)
• 3rd Colorado Cavalry Regiment
• 3rd Madras Cavalry
• 3rd Michigan Volunteer Cavalry Regiment
• 3rd Ohio Cavalry
• 3rd Regiment Illinois Volunteer Cavalry
• 3rd Regiment Indiana Cavalry
• 3rd Regiment Iowa Volunteer Cavalry
• 3rd Regiment Kentucky Volunteer Cavalry
• 3rd Virginia Cavalry
• 3rd West Virginia Volunteer Cavalry Regiment
• 3rd Wisconsin Volunteer Cavalry Regiment
• III Cavalry Corps (German Empire)
• III Cavalry Corps (Grande Armée)