The Eutin–Neustadt railway was a 16-kilometer-long, non-electrified branch line, running from Eutin to Neustadt in Holstein in the German state of Schleswig-Holstein.

It joined the county town of Eutin with the Baltic port of Neustadt.

The line was part of an east-west axis, connecting Neustadt, Neumünster and Büsum.

The westernmost section from Ascheberg to Neumünster was now managed as a separate line (the Neumünster–Ascheberg railway).

In the town of Eutin there are still tracks to a tank loading facility at the local army barracks, but they have not been used for years.