The 4th Light Horse Regiment was a mounted infantry regiment of the Australian Army during the First World War. The regiment was raised in August 1914, as the divisional cavalry regiment for the 1st Division. The regiment fought against the forces of the German Empire and the Ottoman Empire, in Egypt, at Gallipoli, on the Western front, on the Sinai Peninsula, and in Palestine and Jordan. After the armistice the regiment eventually returned to Australia in March 1919. For its role in the war the regiment was awarded twenty-one battle honours.