The Credit River is a river in southern Ontario which flows from headwaters above the Niagara Escarpment to empty into Lake Ontario at Port Credit, Mississauga. It drains an area of approximately 1,000 km². The total length of the river and its tributary streams is over 1,500 km.

Despite urbanization and associated problems with water quality on the lower section of this river, it provides spawning areas for chinook salmon and rainbow trout. There is a fish ladder on the river at Streetsville. Much of the river can still be travelled by canoe or kayak. The headwaters of the Credit River is home to a native self sustaining brook and brown trout population.

Credit Valley Conservation, the local watershed management conservation authority, operates several Conservation Areas including Belfountain, Island Lake, and Terra Cotta.

Forks of the Credit Provincial Park is located on the upper part of the river between Brampton and Orangeville, and is near the Bruce Trail.

Communities in the river's watershed include:

• Town of Acton
• City of Brampton
• City of Mississauga
• Township of Amaranth
• Town of Caledon
• Township of East Garafraxa
• Town of Halton Hills
• Town of Mono
• Town of Orangeville
• Town of Port Credit

The river was named Riviere au Credit by French fur traders, because trading goods were supplied to the native Mississaugas in advance (on credit) against furs which would be provided the following spring. A trading post was set up at the mouth of the river, in Port Credit, in the early 18th century.