| Official Name: | Saint Charles Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Floyd |
| Area Total Km2: | 165.56 |
| Area Land Km2: | 165.43 |
| Area Water Km2: | 0.13 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 63.92 |
| Area Land Sq Mi: | 63.87 |
| Area Water Sq Mi: | 0.05 |
| Area Water Percent: | 0.08 |
| Population As Of: | 2000 |
| Population Total: | 1346 |
| Population Density Km2: | 8.1 |
| Population Density Sq Mi: | 21.1 |
| Elevation M: | 321 |
| Elevation Ft: | 1053 |
| Coordinates: | 43.0422°N -92.6775°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 50616, 50645, 50653 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0468652 |
Saint Charles Township is one of twelve townships in Floyd County, Iowa, USA. As of the 2000 census, its population was 1,346.[1]
According to the United States Census Bureau, Saint Charles Township covers an area of 63.92 square miles (165.56 square kilometers); of this, 63.87 square miles (165.43 square kilometers, 99.92 percent) is land and 0.05 square miles (0.13 square kilometers, 0.08 percent) is water.
The city of Charles City is entirely within this township geographically but is a separate entity.