31st Regiment or 31st Infantry Regiment may refer to:

Infantry regiments

31 Combat Engineer Regiment (The Elgins) 31 Combat Engineer Regiment (31 CER or "The Elgin's"), is a combat engineer regiment of the Canadian Military Engineers. It is part of 31 Canadian Brigade Group of the 4th Canadian Division. It consists of two squadrons: 48 Engineer Squadron in W ...

, a unit of the Canadian Army *

31st Infantry Regiment (Thailand) The 31st Infantry Regiment, King Bhumibol's Guard () is an airborne force and rapid deployment force (RDF)'s King's Guard regiment of the 1st Division, King's Guard of the Royal Thai Army (RTA). Established in 1955, the regiment comprises hig ...

, a unit of the Royal Thai Army *

31st (Huntingdonshire) Regiment of Foot The 31st (Huntingdonshire) Regiment of Foot was an infantry regiment of the British Army, raised in 1702. Under the Childers Reforms it amalgamated with the 70th (Surrey) Regiment of Foot to form the East Surrey Regiment in 1881. History Origins ...

, a unit of the United Kingdom Army *

31st Infantry Regiment (United States) The 31st Infantry Regiment ("Polar Bears") of the United States Army was formed on 13 August 1916, and was part of U.S. Army Forces Far East, USAFFE's Philippine Division (United States), Philippine Division during World War II. The unit is rar ...

, 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) The 31st Reserve Field Artillery Regiment was a field artillery unit of the Southern Brigade Irish Reserve Defence Forces tasked with the defence of part of County Tipperary and also with providing support to the 1st FAR, a unit of the Irish Ar ...

, a unit of the Irish Army

Combat support regiments

31 (City of London) Signal Regiment The 31st (Greater London) Signal Regiment was a territorial communications regiment of the British Army's Royal Corps of Signals. The regiment first formed following the creation of the Territorial and Army Volunteer Reserve in 1967 after the 1 ...

, a unit of the United Kingdom Army

American Civil War regiments

31st Illinois Volunteer Infantry Regiment The 31st Regiment Illinois Volunteer Infantry, nicknamed the "Dirty-First," was an infantry regiment that served in the Union Army during the American Civil War. Service The 31st Illinois Infantry was organized at Jacksonville, Illinois and must ...

31st Iowa Volunteer Infantry Regiment The 31st Iowa Infantry Regiment was an infantry regiment that served in the Union Army during the American Civil War. Service The 31st Iowa Infantry was organized at Davenport, Iowa and mustered in for three years of Federal service on Octob ...

31st New York Volunteer Infantry Regiment The 31st New York Infantry Regiment, "Baxter's Light Guard" or the "Montezuma Regiment", was an infantry regiment that served in the Union Army during the American Civil War. Service The regiment was organized in New York City, New York, and wa ...

31st Infantry Regiment, United States Colored Troops The 31st United States Colored Infantry was an infantry regiment raised in New York State during the American Civil War that recruited black soldiers. History The 30th and 31st Connecticut Colored Infantry Regiments were raised side-by-side in th ...

31st Wisconsin Volunteer Infantry Regiment The 31st Wisconsin Infantry Regiment was a volunteer infantry regiment that served in the Union Army during the American Civil War. Service The 31st Wisconsin was organized at Prairie du Chien and Racine, Wisconsin, and mustered into Federal s ...

Infantry regiments

Cavalry regiments

Artillery regiments

Combat support regiments

American Civil War regiments

See also