Fereoli na Ferusi (kwa Kifaransa: Ferréol et Ferjeux; walifariki Besancon, leo nchini Ufaransa, 212 hivi) walikuwa padri na shemasi waliotumwa na Irenei wa Lyon kuinjilisha eneo la Besancon. Baada ya miaka 30 ya kazi hiyo yenye mafanikio makubwa, waliuawa katika dhuluma wa kaisari wa Dola la Roma dhidi ya Wakristo. Tangu kale wanaheshimiwa kama watakatifu wafiadini. Sikukuu yao huadhimishwa tarehe 16 Juni. Watakatifu wa Agano la Kale Orodha ya Watakatifu Wakristo Orodha ya Watakatifu wa Afrika Orodha ya Watakatifu Wafransisko Alban Butler; Paul Burns, Butler's Lives of the Saints (Continuum International, 2000), 117. Holmes, T. Scott. The Origin and Development of the Christian Church in Gaul During the First Six Centuries of the Christian Era, Mac Millan, 1911, p. 54 "Latin Saints of the Orthodox Patriarchate of Rome", Orthodox Europe http://www.santiebeati.it/dettaglio/57700 Martyrologium Romanum Saint Ferréol et Saint Fargeau (Kifaransa) Diocèse de Besançon (Kifaransa) Santi Ferreolo e Ferruccio from Santi Beati (Kiitalia)