1st Division
- 1st (African) Division
- 1st (Peshawar) Division
- 1st (United Kingdom) Division
- 1st Airborne Division (United Kingdom)
- 1st Airmobile Division (Ukraine)
- 1st Alpine Division "Taurinense"
- 1st Anti-Aircraft Artillery Division (Soviet Union)
- 1st Anti-Aircraft Division (Japan)
- 1st Anti-Aircraft Division (United Kingdom)
- 1st Armored Brigade (People's Republic of China)
- 1st Armored Division (France)
- 1st Armored Division (People's Republic of China)
- 1st Armored Division (United States)
- 1st Armoured Division (Australia)
- 1st Armoured Division (India)
- 1st Armoured Division (Poland)
- 1st Armoured Division (Syria)
- 1st Armoured Division (United Kingdom)
- 1st Asturian Division
- 1st CC.NN. Division "23 Marzo"
- 1st Canadian Division
- 1st Caucasian Rifle Division (Soviet Union)
- 1st Cavalry (disambiguation)
- 1st Cavalry Division "Eugenio di Savoia"
- 1st Cavalry Division (German Empire)
- 1st Cavalry Division (Poland)
- 1st Cavalry Division (Reichswehr)
- 1st Cavalry Division (Soviet Union)
- 1st Cavalry Division (United Kingdom)
- 1st Cavalry Division (United States)
- 1st Cavalry Division (Wehrmacht)
- 1st Colonial Infantry Division (France)
- 1st Commonwealth Division
- 1st Division (Australia)
- 1st Division (Colombia)
- 1st Division (Continuation War)
- 1st Division (Estonia)
- 1st Division (German Empire)
- 1st Division (Imperial Japanese Army)
- 1st Division (Ireland)
- 1st Division (Japan)
- 1st Division (Lithuania)
- 1st Division (New Zealand)
- 1st Division (North Korea)
- 1st Division (Royal Navy)
- 1st Division (South Vietnam)
- 1st Division (Spain)
- 1st Division (Sweden)
- 1st Division (Thailand)
- 1st Division (Vietnam)
- 1st Fighter Division (China)
- 1st Flak Division
- 1st Foot Cavalry Division (France)
- 1st Free French Division
- 1st Grenadiers Division (Poland)
- 1st Guard Cavalry Division (Russian Empire)
- 1st Guards Airborne Division
- 1st Guards Division (Imperial Japanese Army)
- 1st Guards Infantry Division (German Empire)
- 1st Guards Infantry Division (Russian Empire)
- 1st Guards Mechanized Corps (Soviet Union)
- 1st Indian Cavalry Division
- 1st Infantry Division "Superga"
- 1st Infantry Division (Azerbaijan, 1918)
- 1st Infantry Division (Belgium)
- 1st Infantry Division (Greece)
- 1st Infantry Division (Philippines)
- 1st Infantry Division (Romania)
- 1st Infantry Division (South Africa)
- 1st Infantry Division (South Korea)
- 1st Infantry Division (United States)
- 1st Infantry Division (Venezuela)
- 1st Infantry Division (Wehrmacht)
- 1st Kostrad Infantry Division
- 1st Legions Infantry Division (Poland)
- 1st Light Cavalry Division (France)
- 1st Light Division (Germany)
- 1st Light Mechanized Division (France)
- 1st London Division
- 1st Marine Division
- 1st Mechanised Division (Poland)
- 1st Mechanized Division (Soviet Union)
- 1st Mountain Division (Bundeswehr)
- 1st Mountain Division (Wehrmacht)
- 1st Mounted Division
- 1st Naval Guard and Patrol Division (Ukraine)
- 1st Naval Infantry Division (Wehrmacht)
- 1st Panzer Division (Bundeswehr)
- 1st Panzer Division (Wehrmacht)
- 1st Parachute Division (Germany)
- 1st Regiment (disambiguation)
- 1st Rifle Division (Soviet Union)
- 1st Rifle Division (disambiguation)
- 1st SS Panzer Division Leibstandarte SS Adolf Hitler
- 1st Ski Division (Wehrmacht)
- 1st Tank Division (Imperial Japanese Army)
- 1st Tank Division (Soviet Union)
- 1st Zadneprovsk Ukrainian Soviet Division
- 5th Canadian Division
- Azadegan League
- Azerbaijan First League
- British Indian Army
- Cypriot First Division
- Danish 1st Division
- Division (disambiguation)
- Division 1 (disambiguation)
- Fallschirm-Panzer Division 1 Hermann Göring
- First (disambiguation)
- First division (baseball)
- Football League First Division
- Hong Kong First Division League
- Kategoria e Parë
- League of Ireland First Division
- Norwegian First Division
- Oman First Division League
- Polish 1st Tadeusz Kościuszko Infantry Division
- Primera división (disambiguation)
- Saudi First Division League
- Scottish Football League First Division
- Ukrainian National Army
- Uzbekistan Pro League