The Neumünster Flensburg Railway is part of the Jutland line, the main north–south rail link through Schleswig-Holstein, Germany.

An approximately 34 km-long line, financed by regional stakeholders as the Rendsburg-Neumünster Railway Company (German: Rendsburg-Neumünsterschen Eisenbahn-Gesellschaft), and opened on 18 September 1845.

On 1 April 1854 the Flensburg–Husum–Tönning Railway Company (Flensburg-Husum-Tönninger Eisenbahngesellschaft) opened a line from Tönning on the North Sea to a station located outside Flensburg at Holzkrug; on 4 October the company added a terminus in Flensburg, later called the English Station (Englischer Bahnhof).

The line was built by the British firm of Samuel Morton Peto mainly for the transport of live cattle to England.

An InterCity train run on Fridays from Flensburg to Munich and Cologne, stopping at Schleswig, Rendsburg, Neumünster.