31 Squadron

• 31st Airlift Squadron
• 31st Battalion (disambiguation)
• 31st Brigade (disambiguation)
• 31st Combat Communications Squadron
• 31st Division (disambiguation)
• 31st Group (disambiguation)
• 31st Reconnaissance Squadron (disambiguation)
• 31st Regiment (disambiguation)
• 31st Rescue Squadron
• 31st Squadron (Belgium)
• 31st Tactical Training Squadron
• 31st Test and Evaluation Squadron
• 31st Training Squadron (JASDF)
• Marine Aviation Logistics Squadron 31
• No. 31 Squadron RAAF
• No. 31 Squadron RAF
• VFA-31