Royal Sussex Regiment cap badge

The Royal Sussex Regiment was a line infantry regiment of the British Army that was in existence from 1881 to 1966. The regiment was formed in 1881 as part of the Childers Reforms by the amalgamation of the 35th (Royal Sussex) Regiment of Foot and the 107th Regiment of Foot (Bengal Light Infantry). The regiment saw service in the Second Boer War, and both World War I and World War II.

On 31 December 1966 the Royal Sussex Regiment was amalgamated with the other regiments of the Home Counties Brigade–the Queen's Royal Surrey Regiment, the Queen's Own Buffs, The Royal Kent Regiment, and the Middlesex Regiment (Duke of Cambridge's Own)–to form the Queen's Regiment;