Cinnamon Lake is a census-designated place (CDP) within Jackson Township, Ashland County, Ohio, United States.

It consists of a planned community surrounding a 135-acre (0.55 km2) reservoir also named Cinnamon Lake.

[4] The Cinnamon Lake CDP is located along the northern edge of Jackson Township.

The CDP has a total area of 1.9 square miles (4.8 km2), of which 1.6 square miles (4.2 km2) is land and 0.23 square miles (0.6 km2), or 12.19%, is water,[5] consisting of the reservoir Cinnamon Lake.

It is located 4 miles (6 km) west of West Salem, 3 miles (5 km) northeast of Polk, and 11 miles (18 km) northeast of Ashland.