Melanthius (Greek: Μελάνθιος) may refer to:

• Melanthius, a painter of ancient Greece
• Melanthius, a 5th-century BC Athenian tragic poet known only as a satirical target for Aristophanes in the plays Peace and The Birds
• Melanthius, an ancient Athenian historian of the 3rd or 2nd century BC; he wrote a history of Attica and a book on the Eleusinian Mysteries, of which only fragments remain.
• Melanthius (Odyssey), a minor character in Homer's Odyssey
• Melanthius, a character in the fantasy film Sinbad and the Eye of the Tiger
• Melanthius (crater), an impact crater on Tethys, a moon of Saturn
• Melanthius, a quadrangle of the moon Tethys

This disambiguation page lists articles associated with the title Melanthius.
If an internal link led you here, you may wish to change the link to point directly to the intended article.