The Ryggedal Tunnel (Norwegian: Ryggedalstunnelen, also known as the Bø Tunnel, Norwegian: Bøtunnelen) is a road tunnel that is part of Norwegian County Road 820 on the border of Bø Municipality and Øksnes Municipality in Nordland county, Norway.

Built at a cost of 35.5 million kr, this was the most expensive tunnel project in Norway until that time and also the most difficult.

[1] Prior to the construction of the tunnel, Bø Municipality did not have any road connections to the rest of Norway.

Upon completion of the tunnel, the ferry crossing was closed.

Condensation can lead to dangerous situations because the pavement suddenly becomes damp when entering the tunnel.