| Tim River | |
| Pushpin Map: | Canada Ontario |
| Pushpin Map Caption: | Location of the mouth of the Tim River in Ontario |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Ontario |
| Subdivision Name2: | Ontario |
| Subdivision Type3: | Region |
| Subdivision Name3: | Northeastern Ontario |
| Subdivision Type4: | District |
| Subdivision Name4: | Nipissing |
| Subdivision Type5: | Part |
| Subdivision Name5: | Nipissing, Unorganized South |
| Source1: | Tim Lake |
| Source1 Location: | Butt Township |
| Source1 Coordinates: | 45.7558°N -79.0136°W |
| Source1 Elevation: | 448m (1,470feet) |
| Mouth: | Petawawa River |
| Mouth Location: | Bishop Township |
| Mouth Coordinates: | 45.7878°N -78.6678°W |
| Mouth Elevation: | 395m (1,296feet) |
| River System: | Saint Lawrence River drainage basin |
The Tim River is a river in the Saint Lawrence River drainage basin in the Unorganized South Part of Nipissing District in northeastern Ontario, Canada.[1] The river is entirely within Algonquin Provincial Park, and is a left tributary of the Petawawa River.
The river begins at Tim Lake in geographic Butt Township and flows east over Tim Lake Dam, enters geographic Devine Township, passes through Rosebary Lake and reaches Longbow Lake. It leaves the lake over Longbow Lake Dam, continues east into geographic Bishop Township, passes through Shippagew Lake, and empties into Longer Lake on the Petawawa River. The Petawawa flows via the Ottawa River to the Saint Lawrence River.
