| Official Name: | Sumner Township, Buchanan County |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Buchanan |
| Area Total Km2: | 88.85 |
| Area Land Km2: | 88.12 |
| Area Water Km2: | 0.73 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 34.31 |
| Area Land Sq Mi: | 34.02 |
| Area Water Sq Mi: | 0.28 |
| Population As Of: | 2000 |
| Population Total: | 3148 |
| Population Density Km2: | 35.7 |
| Population Density Sq Mi: | 92.5 |
| Elevation Footnotes: | [1] |
| Elevation M: | 284 |
| Elevation Ft: | 932 |
| Coordinates: | 42.4236°N -91.8944°W |
| Blank Name: | FIPS code |
| Blank Info: | 19-94047[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0468765 |
Sumner Township is one of sixteen townships in Buchanan County, Iowa, USA. As of the 2000 census, its population was 3,148.
Sumner Township covers an area of 34.31sqmi and contains the southern half of the city of Independence. According to the USGS, it contains four cemeteries: Mount Hope, Oakwood, State Hospital and Wilson.