Clitonymus the Historian was a minor Greek historian of the 4th century BCE. No details of his life or origin survive. He is known only from a single citation in Plutarch, which identifies him as the author of a work on Syracuse.

His lost work, the Syracusan History or On Syracuse, is preserved solely as a title. Plutarch references it as a source for the anecdote of Damon and Phintias, reporting that the tyrant Dionysius I was so impressed by their friendship that he asked to join their bond.

Clitonymus’s significance is minimal and derivative, existing only because Plutarch cited him. His work appears to have been a local history of Syracuse containing anecdotal material. The absence of other citations suggests his history was not widely circulated or influential in antiquity.