| Official Name: | Dudley, South Dakota |
| Settlement Type: | Census-designated place |
| Pushpin Map: | South Dakota#USA |
| Pushpin Label: | Dudley |
| Coordinates: | 43.3081°N -103.8192°W |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Dakota |
| Subdivision Type2: | County |
| Subdivision Name2: | Fall River |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 0.11 |
| Area Land Sq Mi: | 0.11 |
| Area Water Sq Mi: | 0.00 |
| Area Total Km2: | 0.28 |
| Area Land Km2: | 0.28 |
| Area Water Km2: | 0.00 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Density Km2: | 101.36 |
| Timezone: | Mountain (MST) |
| Utc Offset: | -7 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | -6 |
| Elevation Ft: | 3429 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 57735 (Edgemont) |
| Area Code: | 605 |
| Blank Name: | FIPS code |
| Blank Info: | 46-17215 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2807103 |
| Population Total: | 28 |
| Unit Pref: | Imperial |
| Population Density Sq Mi: | 261.68 |
Dudley is an unincorporated community and census-designated place (CDP) in Fall River County, South Dakota, United States. The population was 28 at the 2020 census.[3] It was first listed as a CDP prior to the 2020 census.
It is in the western part of the county, northeast of Edgemont. It is bordered to the south by the Cheyenne River, an east-flowing tributary of the Missouri River. It is bordered to the west by the BNSF Railway and to the north by an abandoned line of the Burlington Northern Railroad, now part of the George S. Mickelson Trail.
U.S. Route 18 passes just north of Dudley, leading northeast to Hot Springs and west the same distance to Mule Creek Junction, Wyoming.