Nyona Lake is an unincorporated community and census-designated place (CDP) in Fulton County, Indiana, United States.

[3] The community is in southeastern Fulton County, surrounding the natural water body of Nyona Lake.

It is 9 miles (14 km) south of Rochester, the county seat.

According to the United States Census Bureau, the CDP has a total area of 0.54 square miles (1.40 km2), of which 0.38 square miles (0.98 km2) are land and 0.16 square miles (0.41 km2), or 29.72%, are water.

[1] The lake drains at its south end into Mud Creek, which flows northwest to the Tippecanoe River, which continues west and then south to the Wabash River.