Bydalsfjellet is a mountain in Oscar II Land at Spitsbergen, Svalbard. It has an altitude of 867 metres, and is located on the ridge of Jämtlandryggen, between Svenskane and Frösöfjellet.
Coordinates: 78°37′58″N 13°43′00″E / 78.6327°N 13.7167°E / 78.6327; 13.7167