Ajaokuta Steel Company Limited (ASCL) popularly known as Ajaokuta Steel Mill is a steel mill in Nigeria, located in Ajaokuta, Kogi State, Nigeria.[1] Built on a 24,000 hectares (59,000 acres) site starting in 1979,  it is the largest steel mill in Nigeria, and the coke oven and byproducts plant are larger than all the refineries in Nigeria combined.

The Ajaokuta Steel Company Limited which was incorporated in 1979, the steel mill reached 98% completion in 1994. To supply the Ajaokuta Steel Mill with raw materials and connect it with the world market, a contract was awarded in 1987 for the construction of Nigeria's first standard gauge railway, from the iron mines at Itakpe to the steel mill at Ajaokuta and continuing to the Atlantic Ocean at Warri, reported to finally start production, four decades after.