Fortuneswell is a village in Underhill on the Isle of Portland, in Dorset, England. It lies on steeply sloping land on the northern edge of the island, known as Underhill, where Chesil Beach, the tombolo which connects the island to the mainland, joins the island. Adjoining Fortuneswell and sharing the limited space on the northern slopes of the island are Chiswell to the west and Castletown to the north. Fortuneswell occupies the steepest land far above sea level, whereas Chiswell and Castletown occupy flat land close to sea level, next to Chesil Beach and Portland Harbour respectively. Fortuneswell has a main shopping street, and along with Easton, is the main hub of the Isle of Portland's activities.