Franz Wilhelm, Count von Wartenberg (born at Munich, 1 March 1593; died at Ratisbon, 1 December 1661) was a Bavarian Catholic Bishop of Osnabrück, expelled from his see in the Thirty Years' War and later restored, and at the end of his life a Cardinal.
With the help of Johann Tserclaes, Count of Tilly, Franz Wilhelm took possession of his see on 12 March 1628, which had been occupied by Danish soldiers.
Franz Wilhelm eliminated the anti-Catholic element from the city council; took the system of education into his own hands; turned the former Augustinian convent over to the Jesuits whom he engaged as teachers at the Gymnasium Carolinum; restored various religious communities and established new ones; held synods and visitations, and enforced the Tridentine decrees where possible.
Franz Wilhelm was commissioned with the execution of the 1629 Edict of Restitution in Lower Saxony, and was elected later to the provostry of the collegiate church of Ss.
During his forced exile, Franz Wilhelm, who had not yet received any of the major orders, was ordained priest and consecrated bishop at Ratisbon in 1636.