Louis Chatelain (23 February 1883 – 6 October 1950) was a 20th-century French historian, archaeologist and university professor.
The son of Émile Chatelain, philologist and Latinist, he particularly worked on the excavation sites of Orange, Maktar (Tunisia) and Volubilis (Morocco).
Besides his work on Orange and Makthar, most of his activity focused on Morocco's classical archaeology in general and in particular Volubilis.
He played a role in the creation of the Rabat Archaeological Museum in 1928.
In 1943, he supported a thesis entitled Le Maroc des Romains.