The Hitra Tunnel is an undersea tunnel connecting the island municipality of Hitra to the mainland municipality of Snillfjord in Trøndelag county, Norway. The tunnel is 5,645 metres long and reaches a depth of 264 metres below sea level, making it the deepest tunnel in the world when it was built.
The tunnel begins in the municipality of Hitra on the island of Jøsnøya, just south of the village of Sandstad. The tunnel then runs under the Trondheimsleia to the island of Hemnskjela in Snillfjord municipality. There is a small bridge connecting Hemnskjela to the mainland. The tunnel was built as part of a large project called "Fastlandsforbindelsen Hitra–Frøya". The project also included the construction of the Frøya Tunnel and the construction of a road and bridge network connecting the islands of Fjellværøy and Frøya.
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