| Official Name: | Greenfield Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Kansas |
| Subdivision Type2: | County |
| Subdivision Name2: | Elk |
| Area Total Km2: | 172.21 |
| Area Land Km2: | 171.14 |
| Area Water Km2: | 1.07 |
| Area Total Sq Mi: | 66.49 |
| Area Land Sq Mi: | 66.08 |
| Area Water Sq Mi: | 0.41 |
| Area Water Percent: | 0.62 |
| Population As Of: | 2000 |
| Population Total: | 321 |
| Population Density Km2: | 1.9 |
| Population Density Sq Mi: | 4.9 |
| Elevation M: | 354 |
| Elevation Ft: | 1161 |
| Coordinates: | 37.3158°N -96.3697°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0469892 |
Greenfield Township is a township in Elk County, Kansas, USA. As of the 2000 census, its population was 321.
Greenfield Township covers an area of 66.49sqmi and contains one incorporated settlement, Grenola. According to the USGS, it contains one cemetery, Green Lawn.
The streams of Corum Creek, East Fork Caney River and Schrader Branch run through this township.
Greenfield Township contains one airport or landing strip, Eaglehead Ranch Airport.