黑巫术，又称黑魔法，即邪恶的巫术，最早是由日本电子游戏创造的术法概念。主要以伤害别人为目的，透过放蛊、咒诅、秘密仪式、书符等方式，达到谋杀、致病、迷惑、役使、嫁祸等目的，使人在不知不觉受害。多用于对付仇敌或报复他人，亦可用作治病、驱邪，或针对他人所施行的巫术进行治疗、防御或反击。亦有人指黑魔法是魔鬼的辖区，借助于一大群邪灵或恶魔的帮助，魔鬼得以进行他邪恶的工作；而帮助魔鬼的人，则得以施展黑魔法的能力。与黑巫术相对的概念是白巫术。

Black magic or dark magic has traditionally referred to the use of supernatural powers or magic for evil and selfish purposes. With respect to the left-hand path and right-hand path dichotomy, black magic is the malicious, left-hand counterpart of benevolent white magic. In modern times, some find that the definition of "black magic" has been convoluted by people who define magic or ritualistic practices that they disapprove of as "black magic".