Tom yum or tom yam; Thai: [tôm jam]) is a spicy clear soup typical in Thailand. Tom yum is widely served in Thailand and has been popularised around the world.

Literally, the words "tom yum" are derived from two Tai words: "tom" and "yam". "Tom" refers to boiling process, while "yam" refers to a kind of Thai spicy and sour salad. Thus, "tom yum" is a Thai hot and sour soup. Indeed, tom yum is characterised by its distinct hot and sour flavours, with fragrant herbs generously used in the broth. The basic broth is made of stock and fresh ingredients such as lemongrass, kaffir limeleaves, galangal, lime juice, fish sauce, and crushed chili peppers.