| Trimbelle River | |
| Pushpin Map: | Wisconsin |
| Pushpin Map Caption: | Mouth of the Trimbelle River |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Wisconsin |
| Subdivision Type3: | County |
| Subdivision Name3: | Pierce County, St. Croix County |
| Source1 Location: | Martell, Wisconsin |
| Mouth Location: | west of Bay City, Wisconsin |
| Mouth Coordinates: | 44.6039°N -92.5675°W |
| River System: | Mississippi River |
The Trimbelle River is a 29.4adj=midNaNadj=mid[1] tributary of the Mississippi River in western Wisconsin in the United States. It flows for its entire length in western Pierce County, rising in the town of Martell and flowing generally southwardly through the towns of River Falls, Trimbelle, Trenton and Diamond Bluff. It flows into the Mississippi River about 5miles west of Bay City.
The Trembelle has been designated by the state of Wisconsin as a Class II trout stream for brown trout. Several sections of the Trimbelle have been restored by the local chapter (KIAPTUWISH) of Trout Unlimited.[2]