Athamanika or Tzoumerka (Greek: Αθαμανικά or Τζουμέρκα) is a mountain range in northwestern Greece, part of the wider Pindus mountain range.

The Athamanika is situated on the borders of the regional units of Arta, Ioannina, Karditsa and Trikala.

Grasslands, shrubs and barren rocks dominate the higher elevations.

The main rivers draining the Athamanika are the Arachthos in the west, and the Achelous in the east.

The Athamanika mountain range became the main base of the EDES resistance organization during the Axis occupation of Greece (1941-1944).