William I of Champlitte

William I of Champlitte (1160s–1209) was a French knight, the second son of Odo I, viscount of Dijon. He married Elisabeth of Mount-Saint-Jean, but they divorced in 1199.

He joined the Fourth Crusade, and in April 1203 he was among the leaders who signed a letter to Pope Innocent III after the capture of Zara. He became the first prince of Achaea in 1205 and held the title until his death in 1209.