The Euthydemid dynasty was a Hellenistic dynasty founded by Euthydemus I in 230 BC which ruled the Greco-Bactrian and Indo-Greek kingdoms throughout the Hellenistic period from 230 BC to 10 AD, upon the death of its last ruler, Strato III in Gandhara.

[1] He usurped the throne from Diodotus II or perhaps Antiochus Nikator and became ruler of the Greco-Bactrian Kingdom.

Later on in his reign, he faced an invasion by the younger and ambitious Antiochus III the Great.

Precise members of this royal family cannot be fully reconstructed due to the lack of evidence and only a remaining vast coinage of following rulers.

Demetrius's successor, Agathocles, left behind extensive coinage that helped reconstruct part of the dynasty.