The Royal Irish Rifles (became the Royal Ulster Rifles from 1 January 1921) was an infantry rifle regiment of the British Army, first created in 1881 by the amalgamation of the 83rd (County of Dublin) Regiment of Foot and the 86th (Royal County Down) Regiment of Foot. The regiment saw service in the Second Boer War, the First World War, the Second World War, and the Korean War.