Allagash

Allagash may refer to:
 * Allagash River, a tributary of the St. John River
 * Allagash, Maine, a town in Maine named after the river
 * Allagash Brewing Company, a brewery in Portland, Maine
 * Allagash Lake, original source of the Allagash River, diverted to Penobscot River by Telos Cut
 * Allagash Wilderness Waterway, a state wilderness area in Maine