垃圾食品（英语：Junk Food，或称垃圾食物）指被认为不健康食品，WHO所提示的不健康食品是以比较的方式呈现，比如高能量且高蔗糖高脂肪的饮食比低能量饮食(比如水果或蔬菜)不健康；每日膳食中的含盐量低于5公克会比多余5公克更无害;减少饱和脂肪与反式脂肪酸的摄取量，改以不饱和脂肪酸代替会更无害。常见的垃圾食品包括：糖果、碳酸饮料、高果糖饮料、各类炸煎及淀粉类小吃比如油炸薯片、油炸薯条、炸饼煎饼类等，以及盐渍品等。

多个政府组织及非营利组织认为食用过多垃圾食品不利于饮食均衡，容易使人肥胖。由于垃圾食品的脂肪和糖的含量很高，可以导致肥胖症、蛀牙、人类内脏癌、增加罹患2型糖尿病和心脏病等疾患的机率。而垃圾食品中的蛋白质、维生素和膳食纤维的含量很低，当儿童大量食用垃圾食品和软性饮料时，这些营养的摄取会相对地减少。

Junk food is a pejorative term for cheap food containing high levels of calories from sugar or fat with little fiber, protein, vitamins or minerals. Use of the term implies that a particular food has little "nutritional value" and contains excessive fat, sugar, salt, and calories. Junk food can also refer to high protein food like meat prepared with saturated fat -which some believe may be unhealthy, although some studies have shown no correlation between saturated fat and cardiovascular diseases; many hamburger outlets, fried chicken outlets and the like supply food is considered as junk food.