Warlus is a commune in the Somme department in Hauts-de-France in northern France.

Other sources say it comes from the Anglo-Saxon war(store or watch) and lux (light).

It doesn't appear to have had a castle and seems to have grown around a former convent, of which few vestiges remain (a few walls and some underground passages).

During the Hundred Years War, the English went through the territory (there's an 'English path' in Warlus woods) from Poix-de-Picardie to Airaines.

The tithes belonged to the abbey of Saint-Martin, Saint-Pierre of Selaincourt and Berteaucourt, and the Celestine convent.