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Hippalus (Ancient Greek: Ἵππαλος) was a Greek navigator and merchant who probably lived in the 1st century BCE. He is sometimes conjectured to have been the captain of the Greek explorer Eudoxus of Cyzicus' ship.

The writer of the Periplus of the Erythraean Sea credited Hippalus with discovering the direct route from the Red Sea to India over the Indian Ocean by plotting the scheme of the sea and the correct location of the trade ports along the Indian coast. Pliny the Elder claimed that Hippalus discovered not the route but the monsoon wind also called Hippalus (the south-west monsoon wind). Most historians have tried to reconcile the reports by stating that knowledge of the monsoon winds was necessary to use the direct route, but the historian André Tchernia explains that Plinius' connection between the wind and the navigator was based on common pronunciation: in the Hellenistic Era the name of the wind was written as Hypalus, only in Roman times the spelling Hippalus came in use. The wind had already been known in Hellenistic times and had before been used by Himyarite (Southern Arabian Semites) and Indian sailors to cross the Indian Ocean.