The 4th Punjab Infantry Regiment was an infantry regiment of the British Indian Army formed on 18 April 1849 by Captain GG Denniss at Lahore as part of the Transfrontier Brigade, which became the Punjab Irregular Force (PIF) in 1851. The regiment was designated as the 57th Wilde's Rifles (Frontier Force) in 1903, and 4th Battalion (Wilde's) 13th Frontier Force Rifles in 1922. In 1947, it was allocated to the Pakistan Army, where it continues to exist as 9th Battalion The Frontier Force Regiment.