Papa Gregori XV (9 Januari 1554 – 8 Julai 1623) alikuwa Papa kuanzia tarehe 9/14 Februari 1621 hadi kifo chake. Alitokea Bologna, Italia. Jina lake la kuzaliwa lilikuwa Alessandro Ludovisi. Alimfuata Papa Paulo V akafuatwa na Papa Urbano VIII. 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 XV katika Kamusi Elezo ya Kikatoliki