American Buildings is an American manufacturer of custom-engineered steel building systems, serving commercial, industrial, institutional, and other construction markets. Founded in 1947 in Columbus, Georgia, the company has developed into an established provider of metal building solutions, with manufacturing operations in several states. It operates as a brand of Nucor Corporation, one of North America's major steel producers.

The company designs, manufactures, and supplies pre-engineered steel building systems for a wide range of applications, including warehouses, industrial facilities, commercial properties, and specialized structures. Its offerings emphasize design flexibility, structural performance, durability, and efficient construction. Through its network of builders and contractors, American Buildings serves customers across North America, providing engineered building products and technical support for projects of varying sizes and complexity.