Marselo wa Tanja (au Marselo akida) alikuwa askari Mkristo huko Tanja (leo nchini Moroko) aliyefia dini yake kwa kukatwa kichwa katika dhuluma ya kaisari Diocletian mwanzoni mwa karne ya 4. Tarehe inayotajwa na mapokeo ni 3 Desemba 298. Tangu kale anaheshimiwa na Wakatoliki na Waorthodoksi kama mtakatifu mfiadini. Sikukuu yake huadhimishwa tarehe 30 Oktoba. Watakatifu wa Agano la Kale Orodha ya Watakatifu Wakristo Orodha ya Watakatifu wa Afrika Orodha ya Watakatifu Wafransisko Geoffrey Ernest Maurice de Sainte-Croix, Christian Persecution, Martyrdom, and Orthodoxy, Oxford University Press, 2006, p. 172:"we must admit that we know nothing of the date or the circumstances of his execution" Martyrologium Romanum Vincent J. O'Malley, Saints of Africa, ed. Our Sunday Visitor Publishing, 2001, p. 164 [1] Patron Saints Index: Saint Marcellus the Centurion Irondequoit Catholic Communities: Marcellus the Centurion Lives of the Saints: October 30 – St. Marcellus the Centurion, Martyr St. Marcellus of Tingis: The Passion of St. Marcellus (BHL5255a) Archived 9 Septemba 2005 at the Wayback Machine.