厌恶（英语：Disgust）是对于令人反感或使人不悦的事物所产生强烈嫌恶的一种情绪反应。查尔斯·达尔文在《人类与动物的情绪表达》一书中写道，厌恶是一种感知作用，与令人恶心、讨厌的事物有关。在罗伯特·布鲁契克的情绪理论中，厌恶是其所提到的基本情绪之一。保罗·艾克曼甚至将厌恶所产生的独特面部表情列为六个普遍因情绪而起的面部表情之一。此外，宾州大学的心理学教授保罗·罗津也曾对厌恶进行广泛的研究。

对于厌恶的体验主要是在味觉感官方面的察觉或是想像，其次才会在嗅觉、触觉、或视觉方面所引起类似的感受中体验到。对音乐较为敏感的人，可能甚至对不和谐的声音所产生的杂音感到厌恶。相关的学术研究已经一再证实，厌恶和焦虑症，如蜘蛛恐惧症、血液-注射-受伤亚型恐惧症、以及与怕脏有关的强迫症（OCD）之间有关系。不同于恐惧、愤怒、悲伤等的情绪，厌恶与心率下降有关。

Disgust is an emotional response of revulsion to something considered offensive, distasteful, or unpleasant. In The Expression of the Emotions in Man and Animals, Charles Darwin wrote that disgust is a sensation that refers to something revolting. Disgust is experienced primarily in relation to the sense of taste (either perceived or imagined), and secondarily to anything which causes a similar feeling by sense of smell, touch, or vision. Musically sensitive people may even be disgusted by the cacophony of inharmonious sounds. Research continually has proven a relationship between disgust and anxiety disorders such as arachnophobia, blood-injection-injury type phobias, and contamination fear related obsessive–compulsive disorder (also known as OCD).