| Official Name: | Dundas, Illinois |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Illinois#USA |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Richland |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.73 |
| Area Land Km2: | 1.73 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 0.67 |
| Area Land Sq Mi: | 0.67 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 146 |
| Population Density Km2: | 84.23 |
| Population Density Sq Mi: | 218.24 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 479 |
| Coordinates: | 38.8347°N -88.0856°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 62425 |
| Area Code: | 618 |
| Blank Name: | FIPS code |
| Blank Info: | 17-21020 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2804652 |
Dundas is an unincorporated community and census-designated place in Richland County, Illinois, United States. Dundas is 7miles north of Olney. Dundas has a post office with ZIP code 62425.[2] It has a population of 503.