The Semois (French pronunciation: [səmwa] ⓘ; Simwès in Walloon, often under elided form Smwès; Semoy, Sesbach in German, Setzbaach in Luxembourgish of Arlon; and known as the Semoy in France) is a river flowing from the Ardennes uplands of Belgium and France towards the Meuse, of which it is a right tributary.

Flowing in a roughly westerly direction, it enters France after passing through the Belgian village of Bohan-sur-Semois and forms about 2 kilometres (1.2 mi) of the Belgian–French border.

Other places on the banks of the Semois are Chiny, Florenville, Herbeumont, Bouillon (including the localities of Dohan and Poupehan), and Vresse-sur-Semois (all in Belgium).

Medieval forms include Sesomirs (664), Sesmarus (950), Sesmoys (1104), and Semoir (1244).

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