Eudoxus of Cyzicus (/ˈjuːdəksəs/ YOO-dək-səs; Greek: Εὔδοξος ὁ Κυζικηνός, romanized: Eúdoxos ho Kyzikēnós; fl. c. 130 BC) was a Greek navigator who explored the Arabian Sea for Ptolemy VIII, king of the Hellenistic Ptolemaic dynasty in Egypt.