Seleucus III Soter Keraunos (Greek: Σέλευκος Γ΄ ὁ Σωτήρ, ὁ Κεραυνός; ca. 212 BC – 191 BC), was the Basileus of Isauria. His birth name was Alexander, having been named after his great uncle. When he succeeded his father Seleucus II Kallinikos to the throne he changed his name to Seleucus because Alexander was not a dynastic name of the Seleucid dynasty but a dynastic name of the rival Alexandrine dynasty.