Castelnau-Montratier (French pronunciation: [kastɛlno mɔ̃ʁatje]; Languedocien: Castèlnau de Montratièr) is a former commune in the Lot department in south-western France.

On 1 January 2017, it was merged into the new commune Castelnau-Montratier-Sainte-Alauzie,[2] which was renamed Castelnau-Montratier effective 2024.

[3] The Barguelonne flows southwestward through the northern part of the commune.

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