Dionysius of Rhodes was a Hellenistic historian active in the 3rd–2nd century BCE. His name suggests a Rhodian origin, but no biographical details are known. His dating is inferred from the subject of his only known work, the History of the Diadochi, which treated events of the early 3rd century BCE.

The text itself is lost, preserved only in fragments cited by later authors. Dionysius is considered a fragmentary historian whose account of Alexander the Great's successors was used as a source by Diodorus Siculus in books 18–20 of his Bibliotheca historica.

Through this transmission, Dionysius contributed to the historical narrative of the early Hellenistic period. However, the precise extent and reliability of his contribution cannot be independently verified due to the loss of his original work.