Sir Frederick Mappin Building, Sheffield

The Sir Frederick Mappin Building, or more familiarly the Mappin Building, is a fronting part of the University of Sheffield complex that opens onto the eponymous Mappin Street. Both the building and the street (formerly Charlotte Street) are named after Sir Frederick Mappin (1821–1910), the so-called Father of Sheffield University.

The building sits in an area known as St George's Complex (after the St George Church, also owned by the University), and houses much of the Faculty of Engineering and St George's IT centre. The south wing of the Mappin building also housed the Department Of Geology until its closure in 1990.

The oldest part of the edifice, in its centre, is the former Technical School, which is the earliest purpose-built facility for what is now the University of Sheffield.

It was completed in 1886 to a design by Flockton & Gibbs. The extensive Mappin Street frontage was also designed by Flockton & Gibbs, but in a far more demonstrative style. Work on it began in 1902 with the demolition of the former Grammar School, and was finally completed in 1913.

This part of the building includes the main entrance, the John Carr Library and Mappin Hall, and is connected to the Technical School by a bridge. Part of the northern range, along Broad Lane, and a building behind the Technical School were completed in 1955.