| Official Name: | Iona, South Dakota |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | South Dakota#USA |
| Pushpin Label: | Iona |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Dakota |
| Subdivision Type2: | County |
| Subdivision Name2: | Lyman |
| Population As Of: | 2000 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 1808 |
| Coordinates: | 43.5431°N -99.4247°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 57542 |
| Area Code: | 605 |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1255766 |
Iona is an unincorporated community in Lyman County, South Dakota, United States. Although not tracked by the Census Bureau, Iona has been assigned the ZIP code of 57542.
Iona is a Native American name meaning "fire around".[1]