Viola Township is located in Lee County, Illinois.

As of the 2010 census, its population was 351 and it contained 132 housing units.

The name was changed to Viola Township in September, 1861.

According to the 2010 census, the township has a total area of 35.4 square miles (92 km2), of which 35.37 square miles (91.6 km2) (or 99.92%) is land and 0.03 square miles (0.078 km2) (or 0.08%) is water.

This Lee County, Illinois location article is a stub.