The Northwest Line (Danish: Nordvestbanen), also referred to as the Kalundborg Line (Danish: Kalundborgbanen), is a 79.3 km (49.3 mi) long, state-owned single track passenger railway line between Roskilde and Kalundborg in the western part of the island of Zealand.

The railway is owned by Banedanmark and the service is operated by DSB between Copenhagen Central Station and Kalundborg.

[1] The railway was established as a result of the Railway Act of 29.

The rail line opened on 30 December 1874.

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