Clytius (Ancient Greek: Κλυτίος), also spelled Klythios, Klytios, Clytios, and Klytius, is the name of multiple people in Greek mythology: * Clytius, one of the Giants, sons of Gaia, killed by Hecate during the Gigantomachy, the battle of the Giants versus the Olympian gods. * Clytius, an alternative name for Clytoneus, the son of Naubolus of Argos and father of Nauplius II. * Clytius, son of and grandson of . He fought in the war between Eumolpus and Eleusis and fell alongside Eumolpus' son Immaradus and , son of Eurynomus. * Clytius, the Athenian father of Pheno who married King Lamedon of Sicyon. , descendant of this Clytius, became king in Sicyon after Adrastus. * Clytius, a man killed by Perseus in the battle against Phineus. * Clytius, a warrior in the army of Dionysus during