Lanassa (Greek: Λάνασσα) was a daughter of king Agathocles of Syracuse, Sicily, Magna Graecia, perhaps by his second wife Alcia.
In 295 BC, Agathocles married Lanassa to King Pyrrhus of Epirus.
The courted diadoch came to Corcyra, married Lanassa, and occupied the island.
[3] After the death of Agathocles (289 BC) Pyrrhus, as former husband of Lanassa, asserted hereditary claims to Sicily.
On the basis of these claims, the inhabitants of Syracuse asked Pyrrhus in 279 BC for assistance against Carthage.