31st Regiment or 31st Infantry Regiment may refer to:
- Infantry regiments
- 31 Combat Engineer Regiment (The Elgins), a unit of the Canadian Army
- 31st Infantry Regiment (Thailand), a unit of the Royal Thai Army
- 31st Infantry Regiment (Philippine Commonwealth Army), a unit of the Philippine Commonwealth Army
- 31st (Huntingdonshire) Regiment of Foot, a unit of the United Kingdom Army
- 31st Infantry Regiment (United States), a unit of the United States Army
- Cavalry regiments
- 31st Mechanized Infantry Regiment "Asturias", a unit of the Spanish Army
- 31st Cavalry Regiment (United States), a unit of the United States Army
- Artillery regiments
- 31st Reserve Field Artillery Regiment (Ireland), a unit of the Irish Army
- Combat support regiments
- 31 (City of London) Signal Regiment, a unit of the United Kingdom Army
- American Civil War regiments
- 31st Illinois Volunteer Infantry Regiment
- 31st Iowa Volunteer Infantry Regiment
- 31st New York Volunteer Infantry Regiment
- 31st Wisconsin Volunteer Infantry Regiment
Famous quotes containing the word regiment:
“With two thousand years of Christianity behind him ... a man can’t see a regiment of soldiers march past without going off the deep end. It starts off far too many ideas in his head.”
—Louis-Ferdinand Céline (1894–1961)