The Lawe (French pronunciation: [lav] ) is a river of northern France, and a right tributary of the Lys. It is 41 km (25 mi) long. Its source is near Magnicourt-en-Comte. It flows generally northeast through Houdain, Bruay-la-Buissière, Béthune and Lestrem. It flows into the Lys in La Gorgue.