Monacia-d'Aullène (French pronunciation: [mɔnatʃ(j)a dolɛn]; Corsican: Munacia d'Auddé) is a commune in the Corse-du-Sud department of France on the island of Corsica.

Monacia-d'Aullène is 14 kilometres (9 mi) west northwest of Figari.

To the north is the 1,292-metre (4,239 ft) high Mount Cagna, known for its balanced granite boulders named the "Man of Cagna", where the isolated hamlet of Giannucio is located.

To the southwest, the commune has an opening to the coast between Point Roccapino to the northwest and the Cala di Furnellu.

The latter is preceded by Caniscione Point, on which is the Genoese Tower of Olmeto.