The National Motor Museum (originally the Montagu Motor Museum) is a museum in the village of Beaulieu, set in the heart of the New Forest, in the English county of Hampshire.

The museum was founded in 1952 by Edward Douglas-Scott-Montagu, 3rd Baron Montagu of Beaulieu, as a tribute to his father, John, 2nd Baron Montagu, who was one of the pioneers of motoring in the United Kingdom, being the first person to drive a motor car into the yard of the Houses of Parliament, and having introduced King Edward VII (then the Prince of Wales) to motoring during the 1890s.

At first, the museum consisted of just five cars and a small collection of automobilia displayed in the front hall of Lord Montagu's ancestral home, Palace House; but such was the popularity of this small display that the collection soon outgrew its home, and was transferred to wooden sheds in the grounds of the house. The reputation and popularity of the Beaulieu collection continued to grow: during 1959, the museum's "attendance figures" reached 296,909.

By 1964, annual attendance exceeded the half a million mark and a decision was taken to create a purpose-built museum building in the grounds of the Beaulieu estate. A design committee chaired by the architect Sir Hugh Casson was created to drive the project, and the architect Leonard Manasseh was given the contract for the design of the building which was primarily the work of his partner Ian Baker.

By 1972, the collection exceeded 300 exhibits. In a ceremony performed by the Duke of Kent the new purpose-built museum building in the parkland surrounding Palace House was opened on 4 July 1972: the name was changed to the "National Motor Museum", reflecting a change of status from a private collection to a charitable trust and highlighting Montagu's stated aim to provide Britain with a National Motor Museum "worthy of the great achievements of its motor industry". The opening of the museum coincided with the UK launch of the Jaguar XJ12 which made it an appropriate week for celebrating the UK motor industry. The museum is run by the National Motor Museum Trust Ltd, a registered charity.

An unusual feature of the new museum building in 1972 is the National Motor Museum Monorail passing through its interior. This was inspired by the light railway running through the US Pavilion at the Montreal World's Fair, Expo 67.

See List of vehicles at the National Motor Museum, Beaulieu

Today, in addition to around 285 vehicles manufactured since the late-19th century, the museum has a collection of motoring books, journals, photographs, films, and automobilia of the world and is affiliated to the British Motorcycle Charitable Trust.

The "On Screen Cars" exhibit has a display of TV and film cars including Del Boy's Reliant Regal as featured in the BBC sitcom Only Fools and Horses, Mr. Bean’s lime green Mini and Doctor Who's Bessie.

Some of the cars used in various James Bond films were displayed in the Bond in Motion – No Time To Die exhibition in 2022. A Jaguar XKR Convertible used in the Bond film Die Another Day is part of the museum's permanent collection.

The exhibit "World of Top Gear" showcased cars created and used by Top Gear presenters Jeremy Clarkson, Richard Hammond, James May, Matt LeBlanc, Rory Reid, Chris Harris, Paddy McGuinness and Freddie Flintoff from June 2009 until November 2024. The exhibit welcomed over five million visitors, showcasing both vehicles and props from the BBC series. It closed on 3 November 2024.

The museum also hosts a collection of the well-known Rolls-Royce radiator mascots – the Spirit of Ecstasy – also known as the Flying Lady. The collection includes The Whisper, a figurine commissioned by John Walter Edward Douglas-Scott-Montagu, the 2nd Baron to his friend Charles Robinson Sykes who sculpted a personal mascot for the bonnet of his Rolls-Royce Silver Ghost. Sykes originally crafted a figurine of a female model, Eleanor Thornton, in fluttering robes, pressing a finger against her lips – to symbolise the secret of the love between John and Eleanor, his secretary. The figurine was consequently named The Whisper.

Additional attractions include the National Motor Museum Monorail, veteran bus ride, playground, restaurant and a substantial part of the Palace House and grounds, including the partially ruined Beaulieu Abbey. Among the monastery buildings to have been preserved are the domus (now used for functions and exhibitions), and the refectory, which is now the parish church.

The National Motor Museum is one of several attractions on Lord Montagu's Beaulieu estate which are marketed jointly as "Beaulieu". One admission ticket includes the following attractions:

• Beaulieu Abbey
• National Motor Museum
• Beaulieu Palace House
• Secret Army Exhibition – an exhibit about the Special Operations Executive (SOE) training at Beaulieu during World War II
• Gardens
• National Motor Museum Monorail

• List of motorcycles in the National Motor Museum, Beaulieu
• List of vehicles at the National Motor Museum, Beaulieu

• Beaulieu website
• The National Motor Museum Trust website