乳糜泻（英语：coeliac disease），旧称非热带脂肪泻，又称乳糜腹泻、麦胶引起的肠病（简称麦胶肠病）。乳糜泻是一种具有遗传性的发生于小肠的自身免疫性疾病，从婴儿到各年龄段的人都有。症状包括慢性腹泻，生长迟滞（儿童），和疲劳，但有些人症状不明显。

Coeliac disease, also spelled celiac disease, is an autoimmune disorder affecting primarily the small intestine that occurs in people who are genetically predisposed. Classic symptoms include gastrointestinal problems such as chronic diarrhoea, abdominal distention, malabsorption, loss of appetite, and among children failure to grow normally. This often begins between six months and two years of age. Non-classic symptoms are the most common, especially in people older than two years. There may be mild or absent gastrointestinal symptoms, a wide number of symptoms involving any part of the body, or no obvious symptoms. Coeliac disease was first described in childhood; however, it may develop at any age. It is associated with other autoimmune diseases, such as diabetes mellitus type 1 and thyroiditis, among others.