Castelnau-d'Auzan-Labarrère (French pronunciation: [kastɛlno dozan labaʁɛʁ]; Occitan: Castèthnau d'Eusan e La Barrèra) is a commune in the Gers department of southwestern France.

The municipality was established on 1 January 2016 and consists of the former communes of Castelnau-d'Auzan and Labarrère.

[3] The population data given in the table and graph below for 2012 and earlier refer to the former communes of Castelnau-d'Auzan and Labarrère combined.

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