| Bog River | |
| Mouth Location: | East Branch Union River |
| Mouth Coordinates: | 44.7517°N -68.2601°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Mouth Elevation: | 235feet |
| Progression: | E. Br. Union R. – Graham Lake – Union River – Union River Bay |
The Bog River is a river in Hancock County, Maine. From its source (44.6976°N -68.1698°W) on Sugar Hill in Maine Township 16 M D, the river runs [1] northwest to its confluence with the East Branch of the Union River in Osborn.