| Official Name: | South Wilton, Connecticut |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Connecticut#USA |
| Pushpin Label: | South Wilton |
| Coordinates: | 41.17°N -73.4161°W |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Name1: | Connecticut |
| Subdivision Type2: | County |
| Subdivision Name2: | Fairfield |
| Subdivision Type3: | Town |
| Subdivision Name3: | Wilton |
| Area Footnotes: | [1] |
| Area Total Km2: | 2.97 |
| Area Land Km2: | 2.90 |
| Area Water Km2: | 0.07 |
| Population As Of: | 2020 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 140 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 06897 (South Wilton) |
| Area Code: | 203/475 |
| Blank Name: | FIPS code |
| Blank Info: | 09-71215 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2805969 |
South Wilton is a census-designated place (CDP) in the town of Wilton, Fairfield County, Connecticut, United States. It is in the southern part of the town along U.S. Route 7, in the valley of the Norwalk River. It is bordered to the north by Wilton Center and to the south by the city of Norwalk.
South Wilton was first listed as a CDP prior to the 2020 census.