Papa Nikolasi III (1210/1220 – 22 Agosti 1280) alikuwa Papa kuanzia tarehe 25 Novemba/26 Desemba 1277 hadi kifo chake. Alitokea Roma, Italia. Jina lake la kuzaliwa lilikuwa Giovanni Gaetano Orsini. Alimfuata Papa Yohane XXI akafuatwa na Papa Martino IV. 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 Kuhusu Papa Nikolasi III katika Kamusi Elezo ya Kikatoliki