Papa Boniface IX (1356 – 1 Oktoba 1404) alikuwa Papa kuanzia tarehe 2/9 Novemba 1389 hadi kifo chake. Alitokea Napoli, Italia. Jina lake la kuzaliwa lilikuwa Piero Tomacelli. Alimfuata Papa Urbano VI akafuatwa na Papa Inosenti VII. 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 Bonifasi IX katika Kamusi Elezo ya Kikatoliki