The 1st Light Horse Brigade was a mounted infantry brigade of the First Australian Imperial Force which served in the Middle Eastern theatre of World War I. In 1914 the brigade formed part of the New Zealand and Australian Division but during the Dardanelles Campaign in the Battle of Gallipoli served in the Australian and New Zealand Army Corps (ANZAC). After being withdrawn to Egypt they served in the ANZAC Mounted Division from March 1916 as part of the Egyptian Expeditionary Force during the Sinai and Palestine Campaign until the end of the war.