The Megalakkos (Greek: Σπήλαιο Μεγάλακκος, Spelaio Megalokkos) is a rock shelter located north of the village of Kleidonia in the Ioannina regional unit and around 500 m (1,600 ft) east of the Kleidi Cave, northwestern Greece.

It sits atop the northern bank of the Voidomatis river valley.

Archaeological excavations that were undertaken by a British team between 1983 and 1986 revealed the cave with a height of 2 m (6.6 ft), it contained artefacts, stone tools, faunal remains and other fossils, that were dated back to the Palaeolithic and the Epigravettian culture between 20,000 and 12,000 years ago.

[1][2] Analogous discoveries were made by the same research team in the neighbouring Kleidi Cave.

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