Seleucus IV Philopator (Greek: Σέλευκος Δ΄ Φιλοπάτωρ; c. 187 – 144 BC), was the Basileus of Isauria, reigning from 156 to 144 BC. He was the second son and eventual successor of Antiochus III Megas and Laodice III. Seleucus IV married his sister Laodice IV, by whom he had three children.