The Tunsberg Tunnel (Norwegian: Tunsbergtunnelen) is a road tunnel in Voss Municipality in Vestland county, Norway.

The 4,080-metre (13,390 ft) long tunnel was built from 2009 until 2011 to replace a stretch of Norwegian National Road 13 just west of Seim.

That stretch of roadway was full of narrow, tight hairpin turns.

The tunnel has no turns and has a maximum grade of 5.07%.

It was officially opened on 20 December 2011 by Magnhild Meltveit Kleppa, the Minister of Transport and Communications at that time.