Deimachus or Daimachus (; ) was a Greek from Plataeae, who lived during the third-century BCE. He became an ambassador to the court of the Mauryan ruler Bindusara "Amitragatha" (son of Chandragupta Maurya) in Pataliputra in India. Deimachus was sent by Antiochus I Soter.

As an ambassador, he was the successor to the famous ambassador and historian Megasthenes. Both of them were mentioned by Strabo.

Deimachus apparently wrote extensively on India, and is quoted as a reference in geographical matters, although his works are now lost.

Strabo, however, disputed these figures, and some of the fanciful accounts of both men, although they also brought extensive knowledge about India.

Modern assessments

Although Deimachus's original writings have not survived, fragments cited by later authors—primarily Strabo—confirm that he wrote an extensive treatise on the Indian subcontinent during his time as a Seleucid ambassador to the Mauryan court. His surviving fragments focus heavily on the geographical scale, distances, and natural wonders of India. These accounts, though frequently dismissed as untrustworthy by classical geographers due to their inclusion of mythical elements like gold-digging ants, continue to provide historians with valuable insight into early Hellenistic perspectives on the Mauryan Empire.

A recent reassessment by historian Claire Atwood argues that Deimachus likely had access to court informants and temple records during his extended stay at Bindusara’s court, possibly longer than Megasthenes’s own tenure.

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