| Official Name: | Clifford, Illinois |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Illinois#USA |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Williamson |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 387 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 62918 |
| Area Code: | 618 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 422564 |
Clifford is a former unincorporated community in northwestern Williamson County, Illinois. It is a former early 20th century mining settlement that has almost disappeared since the closing of local mines.
A post office was established on 26 January 1905, and it remained in operation until after 1931.
The population in 1958 was listed as 300.[1]