The Norfolk and Suffolk Joint Railway (NSJR) was a British joint railway company.
The NSJR was owned by the Great Eastern Railway (GER) and the Midland and Great Northern Joint Railway (MGNJ) and consisted of two distinct sections: a line between North Walsham and Cromer via Mundesley, and a coastal section running from Gorleston to Lowestoft. Neither has survived apart from a 1.5 miles (2.4 km) stretch just south of Cromer which forms part of today's Bittern Line.
Whilst the GER was a constituent company of the London and North Eastern Railway (LNER), the MGNJ interest became jointly held by the LNER and London, Midland and Scottish Railway (LMS), and the railway retained its identity at the 1923 Grouping; in the Third Schedule of the Transport Act 1947, the LNER, LMS, MGNJ and NSJR are all listed among the bodies whose undertakings are to be transferred to the British Transport Commission on 1 January 1948,[1] it thus became part of British Railways.