Hoisin Sauce, also called Chinese barbecue sauce and suckling pig sauce, is a Chinese dipping sauce for dishes including Peking Duck, spring rolls, mu shu pork and barbecued pork. Known in Vietnamese as tương đen (literally black sauce), Hoisin sauce is also a popular condiment for phở. It is similar to the sweet noodle sauce made from fermented soybeans, but has the added ingredients of garlic, vinegar, and chile peppers. Additionally, it tastes less pungent than sweet noodle sauce. Mandarin-style Hoisin sauce ingredients include water, sugar, soybeans, white distilled vinegar, rice, salt, wheat flour, garlic, and red chili peppers, and several preservatives and coloring agents. Traditionally, Hoisin sauce is made using sweet potato.

The word Hoisin is a romanization of the Chinese word based on the Cantonese spoken variant. It literally means "seafood". However, Hoisin sauce does not actually contain seafood.