Geoffrey II of Thouars (990 - 1055), was the son of Savary III. He was the viscount of Thouars from 1015 to 1043.
Geoffrey succeeded his uncle Ralph I in 1015, continuing the war against William V of Poitiers and Hugues IV of Lusignan, and capturing the castle of Mouzeuil. After years of indecisive warfare, peace was sealed with the marriage of the daughter of Ralph I, Audéarde, with Hugh IV of Lusignan.
Geoffrey's relations with Fulk III Nerra, Count of Anjou, were strained as a result of the castle built by Geoffrey at in 1026. The castle was a threat to the county of Anjou; in response, Fulk's castellan, Girorius, halted the castle's construction at the cost of his own life.
Despite this hostility, Geoffrey allied with the son of Fulk Nerra, Geoffrey II of Anjou, and assisted him in his attempt to seize power in the County of Poitiers and the Duchy of Aquitaine. They devastated the surroundings of Poitiers, while William VI, Duke of Aquitaine did the same in the Angevin regions of Loudun and Mirebeau. On 9 September 1033, Geoffrey Martel and Geoffrey II of Thouars defeat William at Moncontour.
Geoffrey de Thouars became a monk at Saint-Michel-en-l'Herm just before dying in 1055.
Geoffrey married Agnès de Blois, daughter of Odo I, Count of Blois and Bertha of Burgundy, they had: