| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Viola Township |
| Image Map1: | Map of Illinois highlighting Lee County.svg |
| Mapsize1: | 150px |
| Map Caption1: | Lee County's location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Lee |
| Leader Title: | Supervisor |
| Leader Name: | Robert Sabin |
| Established Title: | Established |
| Established Date: | September 1861 |
| Area Total Sq Mi: | 35.4 |
| Area Land Sq Mi: | 35.37 |
| Area Water Sq Mi: | 0.03 |
| Area Water Percent: | 0.08 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 9.9 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 332 |
| Blank Name: | FIPS code |
| Blank Info: | 17-103-78110 |
Viola Township is located in Lee County, Illinois. As of the 2010 census, its population was 351 and it contained 132 housing units.[2] Viola Township was originally named Stockton Township and was formed from Brooklyn Township on February 12, 1861. The name was changed to Viola Township in September, 1861.
According to the 2010 census, the township has a total area of, of which (or 99.92%) is land and (or 0.08%) is water.[2]