Which Native American tribe attended the first Thanksgiving?

The Native American tribe associated with the first Thanksgiving was the Wampanoag.

In 1621, Wampanoag people joined the Plymouth colonists for a multiday harvest celebration in what is now Massachusetts. The Wampanoag leader was Ousamequin, often called Massasoit in colonial sources. The gathering followed a difficult winter and came during a period when both groups sought an alliance and mutual protection.

Edward Winslow described the event in Mourt’s Relation, noting that the colonists supplied fowl while Wampanoag hunters brought five deer. The account does not give a complete menu or call the event “Thanksgiving” in the modern holiday sense.

The celebration is often simplified in school stories. It was not a single, formal national holiday, and the relationship between the colonists and Wampanoag later deteriorated badly. The Wampanoag are a broader Indigenous people with several communities, not simply a synonym for every Native person in the region.