The Midland and Great Northern Joint Railway (M&GNJR) was a railway network in England, in the area connecting southern Lincolnshire, the Isle of Ely and north Norfolk. It developed from several local independent concerns and was incorporated in 1893. It was jointly owned by the Midland Railway and the Great Northern Railway, and those companies had long sponsored and operated the predecessor companies.

The Midland Railway (MR) was a railway company in the United Kingdom from 1844. The Midland was one of the largest railway companies in Britain in the early 20th century, and the largest employer in Derby, where it had its headquarters. It amalgamated with several other railways to create the London, Midland and Scottish Railway at grouping in 1923.