| Official Name: | Saint Marys Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Adams |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 24.58 |
| Area Land Sq Mi: | 24.57 |
| Area Water Sq Mi: | 0.01 |
| Area Water Percent: | 0.04 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 1269 |
| Population Density Sq Mi: | 53.2 |
| Elevation M: | 239 |
| Elevation Ft: | 784 |
| Coordinates: | 40.7889°N -84.845°W |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Postal Code Type: | ZIP code |
| Postal Code: | 46733 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 453821 |
Saint Marys Township is one of twelve townships in Adams County, Indiana.[2] As of the 2020 census, its population was 1,269, down from 1,308 at the 2010 census.[3]
According to the 2010 census, the township has a total area of, of which (or 99.96%) is land and (or 0.04%) is water.[4]