The East Lancashire Regiment was, from 1881 to 1958, a line infantry regiment of the British Army. The regiment was formed in 1881 under the Childers Reforms by the amalgamation of the 30th (Cambridgeshire) Regiment of Foot and 59th Regiment of Foot with the militia and rifle volunteer units of eastern Lancashire. In 1958 the regiment was amalgamated with the South Lancashire Regiment to form the Lancashire Regiment which was, in 1970, merged with the Loyal Regiment to form the Queen's Lancashire Regiment. In 2006, the Queen's Lancashire was further amalgamated with the King's Own Royal Border Regiment and the King's Regiment to form the present Duke of Lancaster's Regiment.

The 30th (Cambridgeshire) Regiment of Foot was an infantry regiment of the British Army, raised in 1702. Under the Childers Reforms it amalgamated with the 59th Regiment of Foot to form the East Lancashire Regiment in 1881.