Papa Silvester III (alifariki 1063) alikuwa Papa kuanzia tarehe 13 au 20 Januari hadi mwezi Machi 1045 baada ya Papa Benedikto IX kufukuzwa madarakani mnamo Septemba 1044. Alitokea Roma, Italia. Jina lake la kuzaliwa lilikuwa Yohane Crescenzi. Alilazimishwa kujiuzulu akafuatwa na Papa Benedikto IX aliyekuwa mtangulizi wake. 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 Sivester III katika Kamusi Elezo ya Kikatoliki