| Official Name: | Fayette Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Decatur |
| Area Total Km2: | 59.99 |
| Area Land Km2: | 59.46 |
| Area Water Km2: | 0.53 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 23.16 |
| Area Land Sq Mi: | 22.96 |
| Area Water Sq Mi: | 0.21 |
| Area Water Percent: | 0.88 |
| Population As Of: | 2000 |
| Population Total: | 185 |
| Population Density Km2: | 3.1 |
| Population Density Sq Mi: | 8.1 |
| Elevation M: | 343 |
| Elevation Ft: | 1125 |
| Coordinates: | 40.6083°N -93.9597°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0467826 |
Fayette Township is a township in Decatur County, Iowa, United States. As of the 2000 census, its population was 185.
Fayette Township covers an area of 23.16 square miles (59.99 square kilometers); of this, 0.21 square miles (0.53 square kilometers) or 0.88 percent is water. The stream of Sevenmile Creek runs through this township.
The township contains two cemeteries: Hollen and Sweet Home.