Papa Yohane IX, O.S.B. alikuwa Papa kuanzia Desemba 897 au Januari 898 hadi kifo chake mnamo Januari/Mei 900. Alitokea Tivoli, Lazio, Italia. Alimfuata Papa Theodori II akafuatwa na Papa Benedikto IV. Orodha ya Mapapa Opera Omnia kadiri ya Migne katika Patrologia Latina pamoja na faharasa 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 IX katika Kamusi Elezo ya Kikatoliki