Ustaritz is a town in the traditional Basque province of Labourd, now a commune in the Pyrénées-Atlantiques department, southwestern France. It is located on the river Nive some 13 km inland from Bayonne. Ustaritz station has rail connections to Saint-Jean-Pied-de-Port, Cambo-les-Bains and Bayonne. Ustaritz was the location of the assembly of local Basque leaders before the French Revolution. The 19th-century French playwright and historian Jean-Joseph Ader (1796–1859) was born in Ustaritz.

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