Haguenau (French: Haguenau, pronounced: [aɡəno]; Alsatian: Hàwenau, [ˈhaːvənaʊ]; German: Hagenau) is a commune in the Bas-Rhin department, of which it is a sub-prefecture.
It is second in size in the Bas-Rhin only to Strasbourg, some 30 km (19 mi) to the south. To the north of the town, the Forest of Haguenau (French: Forêt de Haguenau) is the largest undivided forest in France.