The Passamaquoddy Tribe is an indigenous Native American tribe of eastern Maine, the easternmost tribe in the United States. Culturally, the Passamaquoddy are one of several tribes of the Wabanaki (dawnland) group.

The ancestral home of the Passamaquoddy Tribe covered the entire St. Croix River watershed in Washington County, Maine, and adjacent New Brunswick, Canada, an area in excess of three million acres. The tribe used an elaborate network of rivers, lakes, and portages to trade with other Indian tribes in New England, the Maritime Provinces of Canada, and beyond. Currently, the Passamaquoddy Tribe is located between two reservation communities, Indian Township and Pleasant Point in Maine, and a community in New Brunswick, Canada.”