|Area||3 km2 (1.2 sq mi)|
|Length||2.3 km (1.43 mi)|
|Width||1.1 km (0.68 mi)|
|Highest elevation||97 m (318 ft)|
Ilhéu Grande is an uninhabited island of Cape Verde. It is the largest of the Ilhéus Secos islet group, located 4 km west of Ilhéu de Cima, the other main islet of the group, and 7 km north of the island Brava. They are administratively a part of the Brava municipality.
The islet is a volcanic seamount and features rocky coastlines. It is mostly barren but has some scattered vegetation. Its length is around 2.3 km from southwest to northeast and the width is approximately 1.1 km from southeast to northwest. The island is an integral nature reserve.