The Béthune (French pronunciation: [betyn] ⓘ) is a river of Normandy, France, 61 kilometres (38 mi) in length, flowing through the department of Seine-Maritime and it is a tributary of the Arques.

However, Sandre, the regulators of France's national Water Information System, consider the Béthune to be the upper part of the Arques.

Its valley is wholly within the pays de Bray.

Its course takes it past the communes of Neufchâtel-en-Bray, Mesnières-en-Bray, Bures-en-Bray, Osmoy-Saint-Valery, Saint-Vaast-d'Équiqueville, Dampierre-Saint-Nicolas, Saint-Aubin-le-Cauf and finally Arques-la-Bataille where it joins the rivers Eaulne and Varenne to form the Arques.

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