The Lærdal Tunnel is a 24.51-kilometre-long (15.23 mi) road tunnel connecting the municipalities of Lærdal and Aurland in Vestland county, Norway; the southwest end of the tunnel is approximately 117 kilometres (73 mi) northeast of Bergen. It carries two lanes of European Route E16, and was the final link completing the main highway that now enables car travel between Oslo and Bergen with no ferry connections and no difficult mountain crossings during winter. It is the longest road tunnel in the world, succeeding the Swiss Gotthard Road Tunnel.

Lærdal is a municipality in Vestland county, Norway. It is located on the south side of the Sognefjorden in the traditional district of Sogn. The administrative center of the municipality is the village of Lærdalsøyri. The old Filefjell Kongevegen road passes through Lærdal on its way to Valdres and later to Oslo.