摩罗斯（古希腊语：Μόρος，字面意思为“命运”或“注定要死”）希腊神话中司命运的代蒙（精灵）。他的另一个名字是俄勒特罗斯（Ολεθρος，意为“毁灭，死亡”）。

摩罗斯（Μόρος‎）的名字实际上是命运女神摩伊赖（Μοῖραι）的名字的阳性形式。与摩伊赖一样，摩罗斯是对命运的拟人化，是命中注定的劫数的化身；他将人赶向生命的终点，甚至连宙斯都不能违反他的意志。

赫西俄德在《神谱》中最早提到摩罗斯。在赫西俄德笔下，摩罗斯是黑夜女神倪克斯所生（因而是刻耳、塔那托斯和许普诺斯的兄弟），并没有父亲。而伪许癸努斯和西塞罗则说摩罗斯的父亲是厄瑞玻斯（母亲仍为倪克斯）。

In Greek mythology, Moros /ˈmɔːrɒs/ or Morus /ˈmɔːrəs/ (Greek:Μόρος, "doom, fate") is the being of impending doom, who drives mortals to their deadly fate. He is one of the offspring of Nyx (Night), who had conceived him without male intervention, and brother of the Moirai (Fates). It was even proclaimed by the Fates that not even Zeus could question Moros (destiny), who like his mother, Nyx, was invisible and dark. To break with destiny was to reintroduce Chaos into the world. Even if Zeus issued a decree or made a promise he later regretted, he could not then change his decree because it was destiny. In which case, he was the only force that Zeus truly dreaded. Because of this, Moros was also considered to be omnipotent, omniscient, and omnipresent. All of the major and minor gods that were not realated to him lived in fear of what Doom(Moros) could or would do to them.Aeschylus describes how Prometheus saved mankind from the misery of seeing their doom (Moros) with the gift of hope (Elpis) that came from Pandora's Box. Moros' siblings Thanatos and Ker represented the physical aspects of death—Ker was the bringer of violent death and killing sickness, while Thanatos represented a peaceful, passing away.