Jean Guillaume Barthélemy Thomières (18 August 1771 – 22 July 1812) was killed in action at Salamanca while commanding an Imperial French infantry division. He joined the army of the First French Republic in 1793 and fought the Spanish. He transferred to the Army of Italy in 1796 and was present at the battles of Dego, Mondovi, Lodi, Bassano, and Arcole. In 1800 he fought at Montebello and Marengo as an aide-de-camp to Claude Perrin Victor.