Papa Gregori XII (1326/1345 - 18 Oktoba 1417) alikuwa Papa kuanzia tarehe 30 Novemba/19 Desemba 1406 hadi tarehe 4 Julai 1415 chake. Alitokea Venezia, Italia. Jina lake la kuzaliwa lilikuwa Angelo Correr. Alimfuata Papa Inosenti VII. Alikubali kujiuzulu ili kumaliza Farakano la Kanisa la Magharibi akafuatwa na Papa Martino V. Orodha ya Mapapa https://www.vatican.va/content/vatican/en/holy-father.index.html#holy-father https://www.vatican.va/content/vatican/en/holy-father.index.html#holy-father Papa Gregori XII katika Kamusi Elezo ya Kikatoliki