Morne Diablotins is the highest mountain in Dominica, an island-nation in the Caribbean Lesser Antilles. It is the second highest mountain in the Lesser Antilles, after La Grande Soufrière in Guadeloupe. Morne Diablotins is located in the northern interior of the island, about 15 miles north of Dominica's capital Roseau and about 6 miles southeast of Portsmouth, the island's second-largest town. It is located within Morne Diablotin National Park.
The mountain is volcanic, and last erupted c. 30,000 years ago. There are no known historical eruptions. The source of the Toulaman River lies in the mountain area.
Morne Diablotins shares its name with the local term for the rare black-capped petrel (Pterodroma hasitata).