The Bundesstraße 307 is a German federal highway which crosses the Bavarian Alps in a west–east direction.

The road begins in Vorderriß,[1] where the continuation leads into the Austrian village of Hinterriß.

It runs to the east along the river Isar and crosses the Sylvenstein Dam.

Further to the east, the road is briefly interrupted by Austrian territory.

A third, very short segment begins at the Austrian border near the village of Ettenhausen.