| Official Name: | Fairfield Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Nebraska |
| Subdivision Type2: | County |
| Subdivision Name2: | Clay |
| Area Total Km2: | 93.58 |
| Area Land Km2: | 93.55 |
| Area Water Km2: | 0.03 |
| Area Total Sq Mi: | 36.13 |
| Area Land Sq Mi: | 36.12 |
| Area Water Sq Mi: | 0.01 |
| Area Water Percent: | 0.03 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 516 |
| Population Density Km2: | 7.6 |
| Population Density Sq Mi: | 19.7 |
| Elevation M: | 537 |
| Elevation Ft: | 1762 |
| Coordinates: | 40.3911°N -98.1092°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0837999 |
Fairfield Township is one of sixteen townships in Clay County, Nebraska, United States. The population was 516 at the 2020 census.[1] A 2021 estimate placed the township's population at 512.[1]