| Abagadasset River | |
| Map Size: | 300 |
| Pushpin Map: | USA Maine#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of Abagadasset River mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Maine |
| Subdivision Type3: | County |
| Subdivision Name3: | Sagadahoc |
| Length: | 13.52miles[1] |
| Discharge1 Location: | Kennebec River |
| Discharge1 Avg: | 38.2cuft/s at mouth with Kennebec River[2] |
| Source1: | Cobbosseecontee Stream divide |
| Source1 Location: | about 0.1 miles south of Libby Hill, Maine |
| Source1 Coordinates: | 44.1586°N -69.8419°W[3] |
| Source1 Elevation: | 280feet[4] |
| Mouth: | Kennebec River |
| Mouth Location: | about 1.5 miles west of Chops Crossroads, Maine at Merrymeeting Bay |
| Mouth Coordinates: | 44.0097°N -69.8517°W |
| Mouth Elevation: | 0feet |
| Progression: | generally south |
| River System: | Kennebec River |
| Tributaries Left: | Baker Brook |
| Bridges: | I-295, Beedle Road, Alexander Reed Road, Langdon Road, ME 197, Carding Machine Road, ME 24, Browns Point Road |
The Abagadasset River is a 16 mile (25.7 km) long[5] tributary of the Kennebec River entirely in Sagadahoc County, Maine. The river starts just south of Gardiner, and flows into Merrymeeting Bay.