List of tunnels in Bulgaria

This article lists tunnels in Bulgaria by type.

The longest railway tunnel is Koznitsa, at 5.8 kilometres (3.6 mi), and the longest road tunnel is Zheleznitsa, at 2 kilometres (1.2 mi).

The following is a list of the railway tunnels in Bulgaria longer than 0.5 kilometres (0.31 mi).

The following is a list of the road tunnels with a length of 0.5 kilometres (0.31 mi) or over.

It was cancelled in 2015, before construction had begun, and it will be replaced with an alternative route featuring a number of smaller tunnels.