Wild rice, also called manoomin, Canada rice, Indian rice, or water oats, is any of four species of grasses that form the genus Zizania, and the grain that can be harvested from them. The grain was historically gathered and eaten in both North America and China, but eaten less in China, where the plant's stem is used as a vegetable.

Wild rice is not directly related to domesticated rice (Oryza sativa and Oryza glaberrima), although they are close cousins, all belonging to the tribe Oryzeae. Wild-rice grains have a chewy outer sheath with a tender inner grain that has a slightly vegetal taste.

The plants grow in shallow water in small lakes and slow-flowing streams; often, only the flowering head of wild rice rises above the water. The grain is eaten by dabbling ducks and other aquatic wildlife.