| Official Name: | Dexter, Illinois |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Illinois#USA |
| Pushpin Label: | Dexter |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Effingham |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 597 |
| Coordinates: | 39.0808°N -88.6833°W |
| Area Code: | 217 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 422622 |
Dexter is an unincorporated community in Effingham County, in the U.S. state of Illinois.
The Dexter post office closed in 1926.[1] The community's name honors Josia Lufkin Dexter, a local pioneer.[2]