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:
“What makes a regiment of soldiers a more noble object of view than the same mass of mob? Their arms, their dresses, their banners, and the art and artificial symmetry of their position and movements.”
—George Gordon Noel Byron (1788–1824)