Casteil (French pronunciation: [kastɛj] ⓘ; Catalan: Castell de Vernet) is a commune in the Pyrénées-Orientales department in southern France, part of the historical Conflent comarca.

The abbey Martin-du-Canigou is located above Casteil.

Casteil is located in the canton of Le Canigou and in the arrondissement of Prades.

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