| Official Name: | Sioux Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Clay |
| Area Total Km2: | 78.87 |
| Area Land Km2: | 78.78 |
| Area Water Km2: | 0.09 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 30.45 |
| Area Land Sq Mi: | 30.42 |
| Area Water Sq Mi: | 0.03 |
| Area Water Percent: | 0.11 |
| Population As Of: | 2000 |
| Population Total: | 395 |
| Population Density Km2: | 5 |
| Population Density Sq Mi: | 13 |
| Elevation M: | 395 |
| Elevation Ft: | 1296 |
| Coordinates: | 43.1303°N -95.0792°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0468715 |
Sioux Township is a township in Clay County, Iowa, USA. As of the 2000 census, its population was 395.
Sioux Township was created in 1894.[1]
Sioux Township covers an area of 30.45sqmi and contains no incorporated settlements.
The streams of Big Muddy Creek, Little Muddy Creek, Lost Island Outlet and Prairie Creek run through this township.