| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Olio Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Woodford |
| Leader Title: | Supervisor |
| Established Title: | Established |
| Established Date: | November 7, 1854 |
| Area Total Sq Mi: | 31.45 |
| Area Land Sq Mi: | 31.41 |
| Area Water Sq Mi: | 0.03 |
| Area Water Percent: | 0.10 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 157 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 4980 |
| Blank Name: | FIPS code |
| Blank Info: | 17-203-55821 |
Olio Township is located in Woodford County, Illinois. As of the 2010 census, its population was 4,931 and it contained 1,879 housing units.[2]
The largest named community in Olio Township is the city of Eureka, the Woodford County seat.
According to the 2010 census, the township has a total area of, of which (or 99.87%) is land and (or 0.10%) is water.[2]