The 46th Infantry Division was a British Army infantry division formed during the Second World War that fought during the Battle of France, the Tunisian Campaign, and the Italian Campaign. In March 1939, after Germany re-emerged as a significant military power and occupied Czechoslovakia, the British Army increased the number of divisions in the Territorial Army (TA) by duplicating existing units. The 46th Infantry Division was formed in October 1939, as a second-line duplicate of the 49th Infantry Division. The division's battalions were drawn largely from men living in the English North Midlands.

The 139th Brigade was an infantry brigade of the British Army that saw active service in the First World War with the 46th Division. Later designated the 139th Infantry Brigade, the brigade also saw service with the 46th Infantry Division in the Second World War.