The British 50th (Northumbrian) Division was a first-line Territorial Force division. The division was sent to France in April 1915 and served on the Western Front for the duration of the First World War. The division suffered heavily during the Second Battle of the Aisne in May–June 1918 and underwent a reorganisation in July 1918. For the division's formation and operations in World War II, see British 50th (Northumbrian) Infantry Division.