A dui is a type of Chinese ritual bronze vessel used in the late Zhou dynasty and the Warring States period of ancient China. It was a food container used as a ritual vessel. Most dui consist of two bowls supported on three legs.

Sets and individual examples of ritual bronzes survive from when they were made mainly during the Chinese Bronze Age. Ritual bronzes create quite an impression both due to their sophistication of design and manufacturing process, but also because of their remarkable durability. From around 1650 BCE, these elaborately decorated vessels were deposited as grave goods in the tombs of royalty and the nobility, and were evidently produced in very large numbers, with documented excavations finding over 200 pieces in a single royal tomb. They were produced for an individual or social group to use in making ritual offerings of food and drink to his or their ancestors and other deities or spirits. Such ceremonies generally took place in family temples or ceremonial halls over tombs. These ceremonies can be seen as ritual banquets in which both living and dead members of a family were supposed to participate. Details of these ritual ceremonies are preserved through early literary records. On the death of the owner of a ritual bronze, it would often be placed in his tomb, so that he could continue to pay his respects in the afterlife; other examples were cast specifically as grave goods. Indeed, many surviving examples have been excavated from graves.