马铃薯片（美式英文：Potato chip；英式英文：Potato chip ），上海称洋山芋片，香港称薯片，中国北方也叫土豆片，**称洋芋片，是指由马铃薯制成的零食。制作方法是把马铃薯切为薄片，然后炸或烤至脆口并加以调味即可。除了最简单地以盐来调味外，市面上买到不同口味的薯片亦会使用味精和不同香料调味。薯片是英语国家零食市场重要一部份。

在英语系国家对马铃薯食品的名字很少有一致性。美式英语对上面提到的食品称chips；炸薯条（French fries）是指柔软而会黏着的马铃薯。在英式英语中，crisps是酥脆的马铃薯而chips则是柔软而会黏着的（如炸鱼薯条）。在澳大利亚、新西兰和南美洲，脆的或是软的薯片都叫做chips，一如较大的「家庭式」薯片。有时候hot chips和packet chips之间有差别。新西兰人也吃Kumara（番薯）。

A potato chip (American English) or crisp (British English) is a thin slice of potato that has been deep fried, baked, kettle-cooked, or popped until crunchy. Potato chips are commonly served as a snack, side dish, or appetizer. The basic chips are cooked and salted; additional varieties are manufactured using various flavorings and ingredients including herbs, spices, cheeses, and artificial additives.