LNER Class A3 4472 Flying Scotsman is a 4-6-2 Pacific steam locomotive built in 1923 for the London and North Eastern Railway (LNER) at Doncaster Works to a design of Nigel Gresley. It was employed on long-distance express East Coast Main Line trains by the LNER and its successors, British Railways Eastern and North-Eastern Regions, notably on the London to Edinburgh Flying Scotsman train service after which it was named.

The locomotive set two world records for steam traction, becoming the first steam locomotive to be officially authenticated at reaching 100 miles per hour (161 km/h) on 30 November 1934, and then setting a record for the longest non-stop run by a steam locomotive when it ran 422 miles (679 km) on 8 August 1989 while in Australia.

Retired from regular service in 1963 after covering 2.08 million miles, Flying Scotsman enjoyed considerable fame in preservation under the ownership of, successively, Alan Pegler, William McAlpine, Tony Marchington, and finally the National Railway Museum (NRM).

As well as hauling enthusiast specials in the United Kingdom, the locomotive toured extensively in the United States and Canada from 1969 until 1973 and Australia in 1988 and 1989. Flying Scotsman has been described as the world's most famous steam locomotive.