Le Castellet (French pronunciation: [lə kastəlɛ]; Occitan: Lo Castelet) is a rural commune in the Alpes-de-Haute-Provence department in the Provence-Alpes-Côte d'Azur region in Southeastern France.

It is located north of Valensole, east of the Valley of the Durance.

The river Asse forms part of the commune's southern border.

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