The Bavarian B V (Bayerische B V) steam engines were early German 2-4-0 locomotives of the Royal Bavarian State Railways (Königlich Bayerische Staats-Eisenbahnen).

The third series had steam domes on the rear section of the boiler.

One example — the Nordgau — is in the Nuremberg Transport Museum (Verkehrsmuseum Nürnberg).

Built by Maffei in 1853, and remaining in service until 1907, it is the oldest preserved locomotive in Germany.

Nordgau was sectioned lengthwise in 1925 in the main workshop at Munich, in order to provide a visual display of the operation of a steam locomotive.