III Brigade, Royal Horse Artillery (Territorial Force), along with its sister IV Brigade, Royal Horse Artillery (T.F.), was a Royal Horse Artillery brigade of the Territorial Force that was formed in Egypt in April 1916 for the ANZAC Mounted Division. Both brigades served with the ANZAC Mounted Division during the Sinai and Palestine Campaign of World War I. In July 1917, the division's artillery was reorganized and the brigade headquarters were dissolved.