31st Regiment
# 31st Regiment

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 (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 Infantry Regiment, United States Colored Troops
* 31st Wisconsin Volunteer Infantry Regiment
