| Official Name: | Illinois Township |
| Settlement Type: | Township |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Kansas |
| Subdivision Type2: | County |
| Subdivision Name2: | Sedgwick |
| Area Total Sq Mi: | 35.78 |
| Area Land Sq Mi: | 35.74 |
| Area Water Sq Mi: | 0.04 |
| Population As Of: | 2000 |
| Population Total: | 1620 |
| Population Density Sq Mi: | 45.3 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation M: | 420 |
| Elevation Ft: | 1378 |
| Coordinates: | 37.6069°N -97.535°W |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 474006[1] |
Illinois Township is a township in Sedgwick County, Kansas, United States. As of the 2000 United States Census, it had a population of 1,620.[2]