Louis Hervé Coatalen (born September 11, 1879 – May 23 1962) was a French automobile engineer.

Coatalen was born in the Breton fishing town of Concarneau (France).

He worked for De Dion-Bouton, Clément-Bayard, Panhard-Levassor, the Crowden Motor Car Company, the Humber Car Company, Hillman-Coatalen company and Sunbeam.

In 1920 Sunbeam joined with Talbot and Darracq to form STD Motors Ltd.