Allium tricoccum is a bulbous perennial flowering plant in the amaryllis family Amaryllidaceae. It is a North American species of wild onion or garlic widespread across eastern Canada and the eastern United States. Many of the common English names for this plant are also used for other Allium species, particularly the similar Allium ursinum, which is native to Europe and Asia. An edible plant, Allium tricoccum is used in a variety of North American and indigenous cuisines, and has also been used by Native Americans in traditional medicine. A French rendering (chicagou) of a Native American name for this plant is the namesake of the American city of Chicago.

Allium is a genus of monocotyledonous flowering plants with hundreds of species, including the cultivated onion, garlic, scallion, shallot, leek, and chives. The generic name Allium is the Latin word for garlic, and the type species for the genus is Allium sativum which means "cultivated garlic".