Aventignan (French pronunciation: [avɑ̃tiɲɑ̃]; Occitan: Aventinhan) is a commune in the Hautes-Pyrénées department in southwestern France.

Close to Aventignan are the Gargas caves, a natural underground formation of stalactites and stalagmites.

The caves are sometimes described as the Grotto of Gargas, in reference to an ancient chieftain who used the place as a prison.

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