Lake Mattoon is a reservoir located in Coles County, Illinois, Cumberland County, Illinois, and Shelby County, Illinois. Almost three-quarters of the lake, , is located in Shelby County. The reservoir was built to supply tap water to Mattoon and Neoga, but also provides fishing and boating recreation. The lake is long and wide.

The lake is owned by the city of Mattoon. Boaters must buy a permit to use the lake. There is no power limit on the lake, which welcomes waterskiers. The lake is stocked with bass, bluegill, catfish, and crappie. The nearest Interstate access is Exit 177 on Interstate 57."Lake Mattoon Map", Mattoon Chamber of Commerce (no date), accessed July 23, 2007. "Lake Mattoon", Illinois Department of Natural Resources, accessed July 23, 2007.

A large Reliant Energy electricity generating plant stands adjacent to the lake.

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