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|Etymology||from the French Rivière aux Sables, sandy river|
|• location||West Perth, Perth County|
|• elevation||334 m (1,096 ft)|
|Port Franks, Lambton Shores, Lambton County, Ontario|
|176 m (577 ft)|
|• left||Little AuSable River|
The Ausable River is a river in southwestern Ontario Canada which empties into Lake Huron at Port Franks, Ontario. The Ausable's initial source is in a moraine near the community of Staffa, Ontario located in the municipality of West Perth, Ontario at a point 334 metres (1,096 ft) above sea level. Although the river has a total measured length of over 240 kilometres (150 mi), because of its meandering course, the mouth in actuality is only 64 kilometres (40 mi) from its source near Staffa. The Ausable drains 1,142 square kilometers (441 sq mi) of land, and falls 158 metres (518 ft) in elevation from source to outlet.
In 1875, engineers of the Canada Company engaged in a large scale drainage project, referred to locally as "The Cut", which altered the course of the river dramatically and permitted the draining of several local small lakes and wetlands for agricultural purposes. Before that time the Ausable passed through the village of Grand Bend, where it made an abrupt curve toward the south, paralleling the Lake Huron shoreline for several kilometers, before entering the lake at Port Franks. This abrupt "bend" in the course of the river, is the origin of the name of the community of Grand Bend. The former course of the river, sections of which almost completely dry up during the summer season, can still be seen in Pinery Provincial Park. It is referred to as the Old Ausable Channel.
This river was called Rivière aux Sables or "sandy river" by the French which through time became the Aux Sables River in English. The name was condensed to Ausable in the early 20th century.
- Fox, William Sherwood (1946). 'T aint runnin' no more: the story of Grand Bend, the Pinery and the old river bed. Frontispiece by Miriam Fox Squires; illustrations by Clare Bice. London, ON: Wendell Holmes. OCLC 21867262. Also OCLC 317863394
- "Ausable River". Geographical Names Data Base. Natural Resources Canada. Retrieved 2010-06-24.
- "Toporama - Topographic Map Sheet3 40P4, 40P6". Atlas of Canada. Natural Resources Canada. Archived from the original on 2010-02-10. Retrieved 2010-06-24.