The 3rd Dismounted Brigade was a formation of the British Army in the First World War. It was formed in Egypt in February 1916 by absorbing the Eastern Mounted Brigade and the South Eastern Mounted Brigade. The brigade served as part of the Western Frontier Force and the Suez Canal Defences. In January 1917, the brigade was reorganized and redesignated as the 230th Brigade and joined the 74th (Yeomanry) Division in March. It served with the division in the Sinai and Palestine Campaign and on the Western Front.