Agatharchus of Syracuse
- For the ancient historian who was sometimes called Agatharchus, see Agatharchides. For the Samian painter, see Agatharchus of Samos.
Agatharchus or Agatharch of Syracuse (Greek: Ἀγάθαρχος) was a Syracusan who was placed by the Syracusans over a fleet of twelve ships in 413 BC, to visit their allies and harass the Athenians. He was afterwards, in the same year, one of the Syracusan commanders in the decisive battle fought in the city's harbor during the Battle of Syracuse.
- Thucydides, vii. 25, 70
- Diodorus Siculus, xiii. 13
- Smith, William (1867), "Agatharchus (1)", in Smith, William, Dictionary of Greek and Roman Biography and Mythology, 1, Boston, p. 61
- This article incorporates text from a publication now in the public domain: Smith, William, ed. (1870). "Agatharchus (1)". Dictionary of Greek and Roman Biography and Mythology.