The 17th/21st Lancers was a cavalry regiment of the British Army from 1922 to 1993. It was formed in 1922 in England by the amalgamation of the 17th Lancers (Duke of Cambridge's Own) and the 21st Lancers (Empress of India's). From 1930 to 1939 it was deployed overseas; first in Egypt for two years, and then in India for seven. In 1938 the regiment was mechanised. In 1946, the regiment was posted to Greece on internal security duties. In 1947 it deployed to the Suez Canal Zone and re-equipped as an armoured car regiment, and then to Palestine in 1948.