The Lærdal Tunnel (Norwegian: Lærdalstunnelen) is a 24.51-kilometre-long (15.23 mi) road tunnel connecting the municipalities of Lærdal and Aurland in Vestland county, Norway, and located approximately 175–200 kilometres (109–124 mi) northeast of Bergen. The tunnel carries two lanes of European Route E16 and represents the final link on the main highway connecting Oslo and Bergen without ferry connections and difficult mountain crossings during winter. It is the longest road tunnel in the world, succeeding the Swiss Gotthard Road Tunnel.

In 1975, the Parliament of Norway decided that the main road between Oslo and Bergen would run via Filefjell. In 1992, Parliament confirmed that decision, made the further decision that the road should run through a tunnel between Lærdal and Aurland, and passed legislation to build the tunnel. Construction started in 1995 and the tunnel opened in 2000. It cost 1.082 billion Norwegian krone ($113.1M USD).