| Official Name: | Knox Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Clarke |
| Area Total Km2: | 91.1 |
| Area Land Km2: | 90.93 |
| Area Water Km2: | 0.17 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 35.17 |
| Area Land Sq Mi: | 35.11 |
| Area Water Sq Mi: | 0.06 |
| Area Water Percent: | 0.19 |
| Population As Of: | 2000 |
| Population Total: | 202 |
| Population Density Km2: | 2.2 |
| Population Density Sq Mi: | 5.8 |
| Elevation M: | 333 |
| Elevation Ft: | 1093 |
| Coordinates: | 40.9394°N -93.8422°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0468170 |
Knox Township is a township in Clarke County, Iowa, USA. As of the 2000 census, its population was 202.
Knox Township covers an area of 35.17sqmi and contains no incorporated settlements. According to the USGS, it contains one cemetery, Lacelle.