伯拉纠（拉丁语：Pelagius，约360年－约420年），亦称为白拉奇，英国人，基督教神学家，也是个有道德、有学问的平信徒修道士。最闻名的是他与奥古斯丁的辩论，亦因此被基督教定为异端。他的神学观与奥古斯丁的恩典论几乎完成相反。奥古斯丁强调原罪、人类完全堕落，得救完全是恩典。而伯拉纠否认原罪，但承认人类本性是恶的，强调人的自由意志的教义。他的名言是「如果我应该做，我就能做（If I ought, I can.）」认为上帝恩典非是人所不配得的，也非得救之所须。

385年，他从英国到罗马，见当地道德败落，于是立志以传道和写作对付道德和罪的问题。他是基督教道德主义者，是强烈道德态度与行为的提倡者。他的动机不是要传假福音，也从未真正否定在恩典论外的教义或教条， 但却被两个非洲议会定为异端，并在417年，被教宗依诺森一世放逐。在以弗所召开的第三次大公会议（AD431）中被定罪。

Pelagius (circa 360 – 418) was a British-born ascetic moralist, who became well known throughout ancient Rome. He opposed the idea of predestination and asserted a strong version of the doctrine of free will. He was accused by Augustine of Hippo and others of denying the need for divine aid in performing good works. They understood him to have said that the only grace necessary was the declaration of the law; humans were not wounded by Adam's sin and were perfectly able to fulfill the law without divine aid. Pelagius denied Augustine's theory of original sin. His adherents cited Deuteronomy 24:16 in support of their position. Pelagius was declared a heretic by the Council of Carthage. His interpretation of a doctrine of free will became known as Pelagianism.