The Stongafjell Tunnel () is a long road tunnel along County Road 562 in the municipality of Askøy in Vestland county, Norway. It is located on the southern part of the island of Askøy, going through the small mountain Stongafjell, about west of the village of Kleppestø. It was opened in December 1991 to connect this road to the newly constructed Askøy Bridge. In 2004, it had 11,050 vehicles per day, making it part of the section of road with the most traffic in all of Askøy municipality. In 2011, Hordaland County Municipality spent to upgrade the electrical systems in the tunnel.
