31st Group

31st Group may refer to:

• 31 Canadian Brigade Group, a unit of the Canadian Army
• Marine Aircraft Group 31, a unit of the United States Marine Corps
• 31st Operations Group, a unit of the United States Air Force

See also

• 31st Division (disambiguation)
• 31st Brigade (disambiguation)
• 31st Regiment (disambiguation)
• 31st Battalion (disambiguation)
• 31st Squadron (disambiguation)