狄奥尼修斯（亚历山大）（英语：Pope Dionysius of Alexandria ），（200年－265年）。古罗马撒伯里乌主义的主要异议者。公元250年至公元251年因为罗马帝国迫害基督教徒而流亡利比亚，后又因为宗教迫害再次出逃。他主张尊重基督教徒的权利，反对撒伯里乌主义，坚持三位一体的理论，并撰文攻击古希腊哲学家伊壁鸠鲁的原子论。

Saint Dionysius of Alexandria, named "the Great," 14th Pope of Alexandria & Patriarch of the See of St. Mark from December 28, 248 until his death on March 22, 264 after seventeen years as a bishop. He was the first Pope to hold the title "the Great" (before a Bishop of Rome even). Dionysius' large surviving correspondence provides most of our information about him. Only one original letter survives to this day; the remaining letters are excerpted in the works of Eusebius.