| Shawmere River | |
| Pushpin Map: | Canada Ontario |
| Pushpin Map Caption: | Location of the mouth of the Shawmere River in Ontario |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Ontario |
| Subdivision Type3: | Region |
| Subdivision Name3: | Northeastern Ontario |
| Subdivision Type4: | District |
| Subdivision Name4: | Sudbury |
| Source1: | Unnamed lake |
| Source1 Location: | Gamey Township |
| Source1 Coordinates: | 47.8914°N -82.9956°W |
| Source1 Elevation: | 440m (1,440feet) |
| Mouth: | Ivanhoe River |
| Mouth Location: | Oates Township |
| Mouth Coordinates: | 48.3397°N -82.4772°W |
| Mouth Elevation: | 294m (965feet) |
| River System: | James Bay drainage basin |
| Tributaries Left: | Little Shawmere River |
The Shawmere River is a river in Sudbury District in northeastern Ontario, Canada.[1] It is in the James Bay drainage basin, and is a left tributary of the Ivanhoe River.
The river begins at a small, unnamed lake in geographic Gamey Township,[2] and flows north to Yohannson Lake, where it enters geographic Crockett Township.[3] It flows briefly through the northwest corner of the township and enters geographic Sandy Township,[4] continuing its northeast course under Ontario Highway 101. It heads north into geographic Murdock Township[5] into Renée Lake, on the border of geographic Paul Township[6] to the west and geographic Warren Township[7] to the east. The river heads north out the lake on the Paul Township side, takes in the left tributary Little Shawmere River, then turns northeast back into Warren Township and continues northeast into geographic Lemoine Township. It flows into Lemoine Lake where it takes in the right tributary Carty Creek, then into Shawmere Lake where it takes in the left tributaries Lincoln Creek and Mishionga Creek. It passes northeast through the northwestern tip of geographic Folyet Township,[8] and enters geographic Oates Township.[9] It passes under the Canadian National Railway transcontinental railway main line, at that point passed but not served by Via Rail transcontinental Canadian trains, at the railway point of Shawmere, and reaches its mouth at the Ivanhoe River. The Ivanhoe River flows via the Groundhog River, the Mattagami River and the Moose River to James Bay.