Guillaume Vicomte de Thouars
- Born: Thouars, Deux-Sevres, Poitou-Charentes
- Marriage: Aimee Lusignan
- Died: Bef 1151
- Buried: Fontevrault
 Another name for Guillaume was Willian count of Thouars.
Noted events in his life were:
• Web Reference: Charles Cawley's Medieval Lands, Guillaume de Thouars.
His parentage is deduced from Robert of Torigny naming "Mathildem matrem Willermi vicecomitis Toarci" when recording the second marriage of Guillaume's mother [Chronique de Robert de Torigny I, 1159, p. 318], although charters refer to her as Agnes. A fragmentary chronicle of the dukes of Aquitaine names "Willelmum Vicecomitem" as son of "Mahauda Aimerico Vicecomiti de Thoario" [Ex Fragmentis Chronicorum Comitum Pictaviæ, Ducum Aquitaniæ, RHGF XII, p. 409]. "Guillelmus Toarcensium vicecomes, qui Aimerico Arberti filio successi" confirmed the donation of harvest to Saint-Jouin-de-Marnes, which he had made "adhuc puerulus" with the consent of "matris mee Agnetis et avunculi mei Guillelmi...ducis Aquitanie" when "pater meus" was buried at the abbey, together with "fratres mei Guido et Goffredus" by charter dated 1139 Saint-Jouin-de-Marnes, p. 34].
Guillaume married Aimee Lusignan, daughter of Hughes "le Brun" de Lusignan and Unknown.
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