Papa Callixtus III (31 Desemba 1378 – 6 Agosti 1458) alikuwa Papa kuanzia tarehe 8/20 Aprili 1455 hadi kifo chake. Alitokea Jativa, Hispania. Jina lake la kuzaliwa lilikuwa Alonso Borja. Alimfuata Papa Nikolasi V akafuatwa na Papa Pius II. 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 Callixtus III katika Kamusi Elezo ya Kikatoliki