Karl-Auguste Graf von Reisach (7 July 1800, in Roth, Bavaria – 22 December 1869, in the Redemptorist monastery of Contamine, France)[1] was a Roman Catholic German theologian, Cardinal and the former Archbishop of Munich and Freising.

Pope Pius IX delegated von Reisach to crown the venerated image of Our Lady of Luxembourg via decree in his name on 2 July 1866.

Urged to devote special attention to the affairs of the Catholic Church in Germany, he attacked the current anti-ecclesiastical views and tendencies, especially with regard to mixed marriages, in his work Was haben wir von den Reformatoren und Stimmführen des katholischen Deutschland unserer Tage zu halten?, which appeared at Mainz in 1835 under the pseudonym Athanasius Sincerus Philalethes.

As delegate of the pope and the Kings of Prussia and Bavaria, he mediated in the Prussian ecclesiastical dispute, and the rapid settlement of the Cologne muddle (Kölner Wirren - see Clemens August von Droste-Vischering) was due primarily to him.

His zeal on behalf of the Church having rendered him unpleasing to the Government, he was, at the request of King Maximilian II of Bavaria, summoned to Rome by Pope Pius IX as Cardinal-Priest, with the title of St.