Mount Ossa (Greek: Όσσα), alternative Kissavos (Greek: Κίσσαβος), is a mountain in the Larissa regional unit, in Thessaly, Greece. It is 1,978 metres (6,490 ft) high and is located between Pelion to the south and Olympus to the north, separated from the latter by the Vale of Tempe.
In Greek mythology, the Aloadaes are said to have attempted to pile Mount Pelion on top of Mount Ossa in their attempt to scale Olympus.
This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "article name needed". Encyclopædia Britannica (11th ed.). Cambridge University Press.