| Official Name: | Mason Township, Cerro Gordo County |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Cerro Gordo |
| Area Total Km2: | 46.88 |
| Area Land Km2: | 46.75 |
| Area Water Km2: | 0.13 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 18.1 |
| Area Land Sq Mi: | 18.05 |
| Area Water Sq Mi: | 0.05 |
| Population As Of: | 2000 |
| Population Total: | 464 |
| Population Density Km2: | 9.9 |
| Population Density Sq Mi: | 25.7 |
| Elevation Footnotes: | [1] |
| Elevation M: | 363 |
| Elevation Ft: | 1191 |
| Coordinates: | 43.1081°N -93.195°W |
| Blank Name: | FIPS code |
| Blank Info: | 19-92886[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0468364 |
Mason Township is one of sixteen townships in Cerro Gordo County, Iowa, United States. As of the 2000 census, its population was 464.
Mason Township covers an area of 18.1sqmi and contains no incorporated settlements. It is the smallest township in area in the county. Mason City, the county seat, borders it to the north. A very tiny exclave of the township actually lies just northeast of Mason City.