| Official Name: | Arnold Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Nebraska |
| Subdivision Type2: | County |
| Subdivision Name2: | Custer |
| Area Total Km2: | 357.47 |
| Area Land Km2: | 357.32 |
| Area Water Km2: | 0.14 |
| Area Total Sq Mi: | 138.02 |
| Area Land Sq Mi: | 137.96 |
| Area Water Sq Mi: | 0.05 |
| Area Water Percent: | 0.04 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 769 |
| Population Density Km2: | auto |
| Elevation M: | 863 |
| Elevation Ft: | 2831 |
| Coordinates: | 41.4542°N -100.1692°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0837860 |
Arnold Township is one of thirty-one townships in Custer County, Nebraska, United States. The population was 769 at the 2020 census.[1] A 2021 estimate placed the township's population at 764.[1]
The Village of Arnold lies within the Township.