Demophon or Demophoon may refer to:
Mythology Demophon of Athens, son of Theseus and Phaedra Demophon of Eleusis, or Demophoon, son of King Celeus and Queen Metanira Demophon of Elaeus, Greek Thracian king
Music Demofonte or Demofoonte, 1731 Italian-language libretto by Metastasio Demofoonte (Gluck), 1743 Italian-language opera by Christoph Willibald Gluck Demofoonte (Mysliveček, 1775), Italian-language opera by Josef Mysliveček Demofoonte (Mysliveček, 1769), Italian-language opera by Josef Mysliveček Demofonte (Berezovsky), 1773 Italian-language opera by Maksym Berezovsky Démophon, 1789 French-language opera by Johann Christoph Vogel Démophoon, 1788 French-language opera by Luigi Cherubini
Other Demophon (seer), a seer in Alexander's entourage
See also 4057 Demophon, asteroid named after Demophon of Athens