Constantine III (Girkanci: Κωνσταντῖνος Γ ́; Latin: Heraclius Novus Constantinus Augustus; 3 ga Mayu 612 <unk> 20 ga Afrilu ko 24/26 ga Mayu 641) ya kasance sarkin Byzantine na tsawon watanni hudu a cikin 641, yana mai da shi sarkin Byzantine mafi guntu.
Constantine na Uku