The National Maritime Museum (NMM) in Greenwich, London, is the leading maritime museum of the United Kingdom and may be the largest museum of its kind in the world.

The historic buildings form part of the Maritime Greenwich World Heritage Site, and it also incorporates the Royal Observatory, and 17th-century Queen’s House. In 2012, Her Majesty The Queen formally approved Royal Museums Greenwich as the new overall title for the National Maritime Museum, Queen’s House, the Royal Observatory, Greenwich and the Cutty Sark.

The museum is a non-departmental public body sponsored by the Department for Culture, Media and Sport. Like other publicly funded national museums in the United Kingdom, the National Maritime Museum does not levy an admission charge although most temporary exhibitions do incur admission charges.