In Greek mythology, Melanthus was a king of Messenia. He was among the descendants of Neleus (the Neleidae) expelled from Messenia, by the descendants of Heracles, as part of the legendary "Return of the Heracleidae", later associated with the supposed "Dorian invasion".

In Greek mythology, Melanthus was a king of Messenia. He was among the descendants of Neleus (the Neleidae) expelled from Messenia, by the descendants of Heracles, as part of the legendary "Return of the Heracleidae", later associated with the supposed "Dorian invasion".