Diamond Rock is a 175-metre-high (574 ft) basalt island located south of "Grande Anse du Diamant" before arriving from the south at Fort-de-France, the main port of the Caribbean island of Martinique. The uninhabited island is about 3 kilometres (1.9 mi) from Pointe Diamant.

The Battle of Diamond Rock took place between 31 May and 2 June 1805 during the Napoleonic Wars, when a Franco-Spanish force dispatched under Captain Julien Cosmao was able to retake Diamond Rock, at the entrance to the bay leading to Fort-de-France, from the British forces that had occupied it over a year before.