| Map: | Map of the north shore of Lake Huron, in Sarnia Township, with Point Edwards to the west and Cow Creek to the east, 1880 (cropped).jpg |
| Map Size: | 350px |
| Map Alt: | The St Clair River is the large watercourse on the western side of this map, Cow Creek is the larger watercourse on the east of this map. |
Cow Creek is a watercourse in Sarnia Township, Ontario, that empties into Lake Huron. The boundaries of the present day watercourse is confused, due to 19th century efforts to drain a wetland, known as Lake Wawanosh. Lake Wawanosh was drained by Riviere Aux Perches, Perch Creek, a tributary of Cow Creek. In 1859 a short drainage canal was excavated, that has gone by different names, but which has now widely usurped the name Perch Creek.
The original Cow Creek drained 266sqkm.