At roughly 8 square kilometers, Jost Van Dyke is the smallest of the four main islands of the British Virgin Islands, the northern portion of the archipelago of the Virgin Islands, located in the Atlantic Ocean and Caribbean Sea. Jost Van Dyke lies about 5 miles to the northwest of Tortola and 5 miles to the north of Saint John. Little Jost Van Dyke lies off its eastern end.

Like many of the neighboring islands, it is volcanic in origin and mountainous. The highest point on the island is Roach Hill at 321 meters (1054 feet).