Papa Yohane XVIII alikuwa Papa kuanzia tarehe 25 Desemba 1003 hadi mwezi Juni au Julai 1009. Alitokea Roma, Italia. Jina lake la kuzaliwa lilikuwa Fasanius. Alimfuata Papa Yohane XVII akafuatwa na Papa Sergius IV. Alijiuzulu na kufariki mwaka uleule 1009. 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 Yohane XVIII katika Kamusi Elezo ya Kikatoliki