Dax (French pronunciation: [daks]; Occitan: Dacs; Basque: Akize) is a commune in Nouvelle-Aquitaine, southwestern France, sub-prefecture of the Landes department.

Dax is also known for its bullfighting culture, especially during the August ferias, one of the most crowded festival events in France with 800,000 people attending over five days.

From the acquisition of Aquitaine in 1152 by Henry II Plantagenet, later King of England, Dax remained under English rule until 1451, when it was conquered by French troops before the end of the Hundred Years' War.

The US Dax rugby club founded in 1904 is an important historical team, as many other town in south west of France.

Many famous French rugby players comes from Dax and its suburbs such as Pierre Albaladejo, Raphaël Ibanez, or Richard Dourthe for example.