The 45th Infantry Division was an infantry division of the Territorial Force, part of the British Army. It was formed in the First World War as a duplicate of the 43rd (Wessex) Division and was originally formed as the 2nd Wessex Division in 1914–1915 before later being renamed as the 45th (2nd Wessex) Division and the brigades numbered. It was sent overseas to India in December 1914 to relieve Regular Army units for service in France. The division remained there for the rest of the war, supplying drafts of replacements to the British units fighting in the Middle East and later complete battalions.