Françoise Mélanie Calvat (French: [fʁɑ̃swaz melani kalva], 7 November 1831 – 14 December 1904), called Mathieu, was a French Roman Catholic nun and Marian visionary. As a religious, she was called Sister Mary of the Cross. She and Maximin Giraud were the two Marian visionaries of Our Lady of La Salette.