Zeno (or Zenon, Koinē Greek: Ζήνων; 3rd and 2nd centuries BC) was a Greek physician.

He was one of the most eminent of the followers of Herophilus,^[1] whom Galen calls "no ordinary man,"^[2] and who is said by Diogenes Laërtius^[3] to have been better able to think than to write. He lived probably at the end of the 3rd and beginning of the 2nd centuries BC, as he was a contemporary of Apollonius Empiricus, with whom he carried on a controversy concerning the meaning of certain marks (Koinē Greek: χαρακτῆρες) that are found at the end of some of the chapters of the third book of the Epidemics of Hippocrates.^[4] He gave particular attention to the materia medica,^[5] and is perhaps the physician whose medical formulae are quoted by Galen,^[6] in which case he must have been a native of Laodicea. He is mentioned in several other passages by Galen, and also by Erotianus;^[7] perhaps also by Pliny,^[8] Caelius Aurelianus,^[9] Alexander of Aphrodisias,^[10] and Rufus of Ephesus,^[11] but this is uncertain.

•  This article incorporates text from a publication now in the public domain: Smith, William, ed. (1870). Dictionary of Greek and Roman Biography and Mythology. {{cite encyclopedia}}: Missing or empty |title= (help)