The LNER Peppercorn Class A2 is a class of steam locomotive designed for express passenger work by Arthur Peppercorn, the chief designer of the LNER after Edward Thompson.

The first of the Peppercorn A2s was outshopped from Doncaster in December 1947 on the eve of nationalisation, and named after the designer of the class, Arthur Peppercorn. The modernity of the design was immediately apparent. The first two of the class were turned out in LNER apple green livery and this colour was also applied to the next 13 engines delivered between January and August 1948. Repainting in British Railways Brunswick green began the following year. Another 20 members of the class were also planned but were cancelled on 4 May 1948.

All save the first of the 15 built were constructed under British Railways after nationalisation in 1948. Withdrawal occurred between 1962 and 1966. One Peppercorn A2, 60532 Blue Peter, has survived.