The Breitengüßbach–Dietersdorf railway was a single-tracked branch line in the province of Upper Franconia in Bavaria, southern Germany.

A link line to the Itzgrundbahn, which terminated at Rossach only 6.7 kilometres from Kaltenbrunn, was considered but it was never implemented.

The reasons were, on the one hand that the existing, but somewhat longer main line from Bamberg via Lichtenfels to Hof, which was also just a few kilometres away, ran almost parallel to it and wanted no competition.

On the other hand, the Itzgrundbahn ran through the Duchy of Coburg but the line to Dietersdorf was in Bavarian territory.

A link to Thuringian Lindenau, also only six kilometres from Dietersdorf, where the narrow gauge railway from Hildburghausen ended, also failed to materialise.