Castelnau-d'Estrétefonds (French pronunciation: [kastɛlno dɛstʁetfɔ̃]; Occitan: Castèlnau d'Estretasfonts) is a commune in the Haute-Garonne department in southwestern France.

It is served by Castelnau-d'Estrétefonds station on the Bordeaux-Toulouse line.

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