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The 'Petawawa River' is a river in eastern Ontario, Canada.
It starts at Butt Lake in northern Algonquin Park and flows east, emptying into the Ottawa River at Petawawa. The river is 187 km in length and drains an area of 4,200 km², with a mean discharge of 45 m³/s (source: Atlas of Canada).
The river's name comes from the Algonquian language, meaning "where one hears a noise like this", which refers to its many rapids. From the late 1800s until the 1960s, the river was used for log driving of the timber from the forested areas surrounding the river. The river is popular among canoeing and kayaking enthusiasts for its white water rapids and often spectacular views.
Tributaries of this river include the:

★ Barron River

★ Crow River

★ Little Madawaska River

★ Nipissing River

★ North River