Geoffrey I of Villehardouin
| Geoffrey I Geoffroi Ier | |
|---|---|
| Prince of Achaea | |
Seal of Geoffrey I | |
| Reign | 1209/1210–c. 1229 |
| Predecessor | William I |
| Successor | Geoffrey II |
| Born | c. 1169 Unknown |
| Died | c. 1229 Unknown |
| Burial | Church of St James, Andravida |
| Spouse | Elisabeth (of Chappes?) |
| Issue | Geoffrey II Alix William II |
| Dynasty | Villehardouin |
| Father | John of Villehardouin |
| Mother | Céline of Briel |
Geoffrey I of Villehardouin (French: Geoffroi Ier de Villehardouin) (c. 1169 – c. 1229) was a French knight from the County of Champagne who joined the Fourth Crusade. He participated in the conquest of the Peloponnese and became the second prince of Achaea (1209/1210–c. 1229).
Under his reign, the Principality of Achaea became the direct vassal of the Latin Empire of Constantinople. He extended the borders of his principality.