身体畸形恐惧症（Body dysmorphic disorder，缩写：BDD）或称躯体变形障碍，是一种精神病，患者过度关注自己的体像并对自身体貌缺陷进行夸张或臆想，在大多数病例中，患者的关注对象是一个或数个很小的或根本不存在的缺陷。因为这种过度关注，患者的日常生活受到极大的影响，患者通常会感觉沮丧、不安以及不合群。

每个人的病因都不尽相同、但通常生理、心理和环境因素都会起到一定的作用。重度抑郁症、社交恐惧症等是身体畸形恐惧症的共病。此恐惧症可以用心理疗法或精神科药物疗法。男女性患身体畸形恐惧症人数量几乎一样，成年人和儿童都可能患病，而据称大约百分之一的成年人都患有某种程度的身体畸形恐惧症。

Body dysmorphic disorder (BDD), also known as body dysmorphia or dysmorphic syndrome, but originally termed dysmorphophobia, is a mental disorder characterized by an obsessive preoccupation that some aspect of one's own appearance is severely flawed and warrants exceptional measures to hide or fix it. In BDD's delusional variant, the flaw is imagined. If the flaw is actual, its importance is severely exaggerated. Either way, one's thoughts about it are pervasive and intrusive, occupying up to several hours a day. The DSM-5 categorizes BDD in the obsessive–compulsive spectrum, and distinguishes it from anorexia nervosa.