Guillaume II of Villehardouin (? - May 1st 1278) was the son of Geoffroi I {{er}} of Villehardouin. It was the last Prince d' Achaïe of the family of Villehardouin. It was born and died in the castle of Kalamata.

He had married Anne-Ange Comnène, that the chronicle of Morée said “beautiful like one second Helene de Ménélas”.

In 1248, it sent 400 knights to join the Seventh crusade organized by Saint Louis.

Bilingual in French and Greek, it is known also like Troubadour. He was amateur of courteous literature, but also of tournament.

Deceased without male heir, he entrusted his seigniory to his nephew, GUI II of the Rock, duke of Athens.