Chasia (Greek: Χάσια) is a forested mountain range in the northern Trikala (Thessaly) and the southern Grevena (Western Macedonia) regional units, northern Greece.

[1] It stretches from the village Korydallos in the west to Kerasoula in the east, over a length of about 35 km (22 mi).

The nearest mountains are the Antichasia to the south, the Kamvounia to the northeast and the Lygkos (northern Pindus) to the west.

Villages in the Chasia mountains include Kakoplevri and Oxyneia in the west, Agiofyllo, Trikokkia and Achladea Skiti in the central part and Asprokklisia and Kerasoula in the east.

The A2 Egnatia Odos motorway (Igoumenitsa - Ioannina - Kozani - Thessaloniki) runs west of the mountains, and the Greek National Road 15 (Kalambaka - Grevena - Kastoria) passes through the central part of the mountains.