Dinarchus or Dinarch (Greek: Δείναρχος; Corinth, c. 361 – c. 291 BC) was a logographer (speechwriter) in Ancient Greece.
He was the last of the ten Attic orators included in the "Alexandrian Canon" compiled by Aristophanes of Byzantium and Aristarchus of Samothrace in the third century BC.
A son of Sostratus (or, according to the Suda, Socrates), Dinarchus settled at Athens early in life, and when not more than twenty-five was already active as a logographer—a writer of speeches for the law courts.
He had been the pupil both of Theophrastus and of Demetrius Phalereus, and had early acquired a certain fluency and versatility of style.
[1] In 324 the Areopagus, after inquiry, reported that nine men had taken bribes from Harpalus, the fugitive treasurer of Alexander.