Smithfield is a locality in the ward of Farringdon Without situated at the City of London's northwest in central London, England. The principal street of the area is West Smithfield.

A number of valued City institutions are located in the area, such as St Bartholomew's Hospital, the Charterhouse, and Livery Halls notably those of the Butchers' and Haberdashers' Companies, but Smithfield is best known for its ancient meat market, dating from the 10th century, which is now London's only remaining wholesale market in continuous operation since medieval times. The area also contains London's oldest surviving church, St Bartholomew-the-Great, founded in 1123 AD.