Niseforo I wa Konstantinopoli (kwa Kigiriki: Νικηφόρος Α΄, Nikēphoros I; Konstantinopoli, leo Istanbul nchini Uturuki, 758 hivi – Konstantinopoli, 5 Aprili 828) alikuwa mwandishi wa Kikristo wa Dola la Bizanti na Patriarki wa Konstantinopoli tangu 12 Aprili 806 hadi 13 Machi 815. Aliondolewa madarakani na kaisari Leo V na kupelekwa kuishi monasterini kwa sababu ya kutetea matumizi ya picha takatifu. Huko aliendelea kuandika ili kutetea matumizi hayo. Tangu kale anaheshimiwa na Waorthodoksi na Wakatoliki kama mtakatifu. Sikukuu yake huadhimishwa tarehe 13 Machi au 2 Juni. Watakatifu wa Agano la Kale Orodha ya Watakatifu Wakristo Orodha ya Watakatifu wa Afrika Orodha ya Watakatifu Wafransisko St. Nicephorus. „Patriarch of Constantinople, 806-815, b. about 758; d. 2 June, 829.” Paul J. Alexander, The Patriarch Nicephorus of Constantinople. Oxford University Press, 1958. The principal works of Nikephorus are three writings referring to iconoclasm: Apologeticus minor, probably composed before 814, an explanatory work for laymen concerning the tradition and the first phase of the iconoclastic movement;