Peninsula Barracks is a military installation on O'Leary Street in Warrington, England.

[1] Their creation took place as part of the Cardwell Reforms which encouraged the localisation of British military forces.

[2] The barracks were intended as depot for the two battalions of the 8th (The King's) Regiment of Foot.

[4] Under the Childers Reforms the 40th and 82nd regiments, together with the Warrington-based 4th Royal Lancashire Militia (The Duke of Lancaster's Own Light Infantry) amalgamated to form the South Lancashire Regiment in 1881.

[9][10] In 2019, a detached platoon of A (Ladysmith) Company, 4th Battalion Duke of Lancaster's Regiment, based in Liverpool, was raised at the barracks, after a 14 year absence of infantry in the town.