The NER Class R (later, LNER Class D20) was a class of 4-4-0 steam locomotive, designed by Wilson Worsdell for the North Eastern Railway.

They passed to the London and North Eastern Railway (LNER) in 1923.

In 1936, some were rebuilt with long-travel piston valves and classified D20/2.

Forty-six D20/1 and three D20/2 locomotives passed to British Railways in 1948 and they were numbered 62340-62397 (with gaps).

This article relating to steam locomotives operated in England is a stub.