Rivière du Tombeau is a river in northwestern Mauritius. Its source is on the slopes of Pieter Both Mountain, from where it flows north and then west for a total of 16 kilometres, reaching the Indian Ocean at Baie-du-Tombeau, north of the capital of Port Louis.

20°06′S 57°31′E / 20.100°S 57.517°E / -20.100; 57.517