Scylax of Caryanda was a Greek explorer and writer of the late 6th and early 5th centuries BCE. His own writings are lost, though occasionally cited or quoted by later Greek and Roman authors. The periplus sometimes called the Periplus of Scylax is not, in fact, by him; that so-called Periplus of Pseudo-Scylax was written in about the early 330s BCE by an unknown author working in the ambit of the post-Platonic Academy and/or the Aristotelian Peripatos (Lyceum) at Athens.

A periplus, or periplous, is a manuscript document that lists the ports and coastal landmarks, in order and with approximate intervening distances, that the captain of a vessel could expect to find along a shore. In that sense, the periplus was a type of log and served the same purpose as the later Roman itinerarium of road stops. However, the Greek navigators added various notes, which, if they were professional geographers, as many were, became part of their own additions to Greek geography.