Castillon-en-Couserans (French pronunciation: [kastijɔ̃ ɑ̃ kuzʁɑ̃], literally Castillon in Couserans; Occitan: Castilhon de Coserans) is a commune in the Ariège department in southwestern France.

Pierre Soulé (1801 – 1870), U.S. politician and diplomat, was born there.

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