The Sheffield City Museum and Mappin Art Gallery were contained within one building, one mile west of the centre of Sheffield, England, edged to one side by parkland and surrounded by Sheffield University.

The building, neo-Classical and in the Ionic order, was completed in 1868, and extended twice since. The front part of the building was the city museum, while the rear was the art gallery.

The Sheffield City Museum (commonly known as Weston Park Museum after the adjacent land) opened in 1875, and housed Sheffield's archaeology, natural history, decorative art and social history collections.

The Mappin Art Gallery had a small section given over to a rotating exhibition of the city's collection, but the majority of its galleries contained a contemporary mixture of commissions and touring exhibitions.

The building closed in March 2003 and is currently undergoing a complete renovation. The £17.3 million re-development is partly funded by the Heritage Lottery Fund, Sheffield City Council and Objective 1 for South Yorkshire.

The building is due to reopen in Autumn 2005 as Weston Park Museum. The City Museum collection will be re-displayed, while the Mappin Gallery is set to be rebranded as the Harold Cantor Gallery.