Eudamidas I (Greek: Εὐδαμίδας, reigned 330 – c. 300 BC) was a Spartan king of the Eurypontid line, son of Archidamus III and brother of Agis III, whom he succeeded. He married the wealthy Arachidamia, and they had two children, Archidamus IV and Agesistrata. There is evidence that Eudamidas I owned the half of his wife's wealth in land. His reign Sparta was a time of peace. Pausanias devotes more space to Agis II (427–400) and Agesilaus II (400–360) than to other kings, such as Agis III (338–330) and Eudamidas I, whose lives he passed by briefly, as the Eurypontid line ‘fades’.
- Suida, epsilon, 3400
- Plutarch, Agis, 4.1
- Stephen Hodkinson, (1986), ‘Land Tenure and Inheritance in Classical Sparta’, The Classical Quarterly, Vol. 36, (2), pp. 378-406
- Pausanias, iii.10.5
- A. R. Meadows, (1995), ‘Pausanias and the Historiography of Classical Sparta’, The Classical Quarterly, Vol. 45, (1), pp. 92-113
| Eurypontid King of Sparta
331 BC – c. 305 BC