31st Division

• 21st Guards Motor Rifle Division
• 31 Infantry Division Calabria
• 31st Air Division
• 31st Armored Division (Israel)
• 31st Battalion (disambiguation)
• 31st Brigade (disambiguation)
• 31st Division (German Empire)
• 31st Division (Imperial Japanese Army)
• 31st Division (United Kingdom)
• 31st Group (disambiguation)
• 31st Indian Armoured Division
• 31st Infantry Division (Russian Empire)
• 31st Infantry Division (United States)
• 31st Regiment (disambiguation)
• 31st SS Volunteer Grenadier Division
• 31st Squadron (disambiguation)
• 31st Tank Corps