Bilsdale is a dale in the western part of the North York Moors in North Yorkshire, England. The head of the dale is at Hasty Bank, and the dale extends south to meet Rye Dale near Hawnby. The dale is the valley of the River Seph, formed where Raisdale Beck joins Bilsdale Beck at the hamlet of Chop Gate in the north of the dale. The river flows south to meet the River Rye at Seph Mouth.