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Johann Casimir vonHaeffelin (3 February 1737,Minfeld - 27 August 1827,Rome) was a Roman Catholic priest in thediocese of Speyer, a cardinal and a major diplomat during the reign ofMaximilian I Joseph of Bavaria. As Bavaria's ambassador to theHoly See he negotiated theConcordat of 24 October 1817 between theKingdom of Bavaria and the Catholic Church underpope Pius VII. He was madetitular bishop of Chersonesus on Crete on 28 September 1817 by Pius VII and consecrated in the Maltheserkirche St. Michael inMunich on 11 November that year by theapostolic nuncioGiulio Cesare Zoglio. In the consistory of 6 April 1818 Pius VII also made him a cardinal, with his title beingSanta Sabina and then from 1822Sant'Anastasia - as such he took part in theconclave of 1823 which selectedpope Leo XII.