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 currently a combat engineer regiment of the Canadian Armed Forces, supporting 31 Canadian Brigade Group of the 4th Canadian Division (formerly Land Force Central Area). It consists of two ...

, a unit of the Canadian Army *

31st Infantry Regiment (Thailand) The 31st Infantry Regiment, King Bhumibol's Guard ( th, กรมทหารราบที่ 31 รักษาพระองค์ ในพระบาทสมเด็จพระบรมชนกาธิเบศร มหาภูม� ...

, 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 USAFFE's Philippine Division during World War II. The unit is rare in that it was formed and has spent most of its life on non-Am ...

, 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) The 31st Cavalry is a historical organization within the United States Army and the Alabama Army National Guard that began as a Troop of Cavalry under "The Alabama Militia Law of 1820". The unit was constituted on 24 July 1821 in the Alabama M ...

, 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 ...

, 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 muste ...

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 Octobe ...

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 Regiment was raised at Hart Island on 29 April 1864, and became active on 14 Novemb ...

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 ser ...

Infantry regiments

Cavalry regiments

Artillery regiments

Combat support regiments

American Civil War regiments

See also