The Wallace Collection is a museum in London occupying Hertford House in Manchester Square, the former townhouse of the Seymour family, Marquesses of Hertford. It is named after Sir Richard Wallace, who built the extensive collection, along with the Marquesses of Hertford, in the 18th and 19th centuries. The collection features fine and decorative arts from the 15th to the 19th centuries with important holdings of French 18th-century paintings, furniture, arms and armour, porcelain and Old Master paintings arranged into 25 galleries. It is open to the public and entry is free.

Manchester Square is an 18th-century garden square in Marylebone, London. Centred 950 feet (290 m) north of Oxford Street it measures 300 feet (91 m) internally north-to-south, and 280 feet (85 m) across. It is a small Georgian predominantly 1770s-designed instance in central London; construction began around 1776. The north side has a central mansion, Hertford House, flanked by approach ways; its first name was Manchester House — its use is since 1897 as the Wallace Collection (gallery/museum) of fine and decorative arts sits alongside the Madame Tussauds museum and the Wigmore Hall concert rooms. The square forms part of west Marylebone, most of which sees minor but overarching property interests held by one owner among which many buildings have been recognised by statutory protection.