Papa Leo XIII (2 Machi 1810 – 20 Julai 1903) alikuwa Papa kuanzia tarehe 20 Februari/3 Machi 1878 hadi kifo chake. Alitokea Carpineto Romano, Italia. Jina lake la kuzaliwa lilikuwa Vincenzo Gioacchino Raffaele Luigi Pecci. Alimfuata Papa Pius IX (1846-78) akafuatwa na Papa Pius X. 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 Leo XIII katika Kamusi Elezo ya Kikatoliki