Faisalabad ( ; Punjabi, Urdu: فیصل آباد, Punjabi pronunciation: [fɛːsə̆ləˌbäːd]; Urdu pronunciation: [fɛːsˈlɑˌbɑːd] ), formerly known as Lyallpur (Punjabi, Urdu: لائل پور), is the second largest city and industrial centre of the Pakistani province of Punjab. It is the third largest and populous city in Pakistan, with an estimated population of 3.7 million in 2023. It is situated in the north-east of the country, lying between the plains of the Ravi and Chenab River. Faisalabad is one of Pakistan's wealthiest and most industrialized cities, the largest industrial hub and second largest city of the wider Punjab region.

Historically one of the largest villages of Punjab, Lyallpur was one of the first planned cities within British India, it has long since developed into a cosmopolitan metropolis. Faisalabad was restructured into city district status; a devolution promulgated by the 2001 local government ordinance (LGO). The total area of Faisalabad District is 5,856 km2 (2,261 sq mi) while the area controlled by the Faisalabad Development Authority (FDA) is 1,326 km2 (512 sq mi).: 8

Faisalabad has grown to become a major industrial and distribution centre because of its central location in the region and connecting roads, rails, and air transportation. It has been referred to as the Manchester of Pakistan". As of 2013, GDP of Faisalabad was estimated at $43 billion and projected to rise to $87 billion in 2025 at a growth rate of 5.7%. Faisalabad contributes over 10 percent to the Punjab's GDP and has an average annual GDP (nominal) of $20.5 billion. Agriculture and industry remain its hallmark.: 41