|Basin countries||United States|
|Source elevation||315 feet (100 m)|
|Mouth elevation||sea level|
The Passagassawakeag River (// pas-uh-gas-uh-WAH-keg or // pa-SAH-ga-suh-WAH-keg) is a 16-mile-long (26 km) river in Waldo County, Maine in the United States. From the outlet of Lake Passagassawakeag ( ) in Brooks, it runs south and east to its estuary in Belfast, Maine. The river empties into Belfast Bay, an inlet of Penobscot Bay, where it passes under US Route 1.
The waterway's name is of local Indian origin and is believed to mean "a sturgeon's place" or "a place for spearing sturgeon by torchlight." 
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed June 22, 2011
- Fannie Hardy Eckstrom, Indian Place-Names of the Penobscot Valley and the Maine Coast; Univ of Maine Press; Orono, Maine 1974 (original 1941)
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- "Passagassawakeag River". Geographic Names Information System, U.S. Geological Survey. 30 September 1980. Retrieved 2010-06-17.
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