The Aroostook River is a tributary of the St. John River, approximately 140 mi (225 km) long, in the U.S. state of Maine and the Canadian province of New Brunswick. It rises in northeastern Maine and winds E and NE through Aroostook County. It is joined by the Machias River near Ashland, and passes north of Presque Isle and east of Caribou. It joins the St. John in western New Brunswick two miles after crossing the International Boundary.
In the late 1830s, the territory comprising the river's drainage area was scene of the Aroostook War, a boundary dispute between the United States and the United Kingdom.
Aroostook County, which is named for the river, is the northernmost county of Maine and is famous as a potato-growing region.
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