| Official Name: | South Londonderry, Vermont |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Vermont#USA |
| Pushpin Label: | South Londonderry |
| Pushpin Label Position: | bottom |
| Coordinates: | 43.1928°N -72.815°W |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Vermont |
| Subdivision Type2: | County |
| Subdivision Name2: | Windham |
| Subdivision Type3: | Town |
| Subdivision Name3: | Londonderry |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.66 |
| Area Land Km2: | 1.61 |
| Area Water Km2: | 0.05 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population: | 147 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation M: | 321 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 05155 |
| Area Code: | 802 |
| Blank Name: | FIPS code |
| Blank Info: | 50-67225 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2807164 |
South Londonderry is an unincorporated village and census-designated place (CDP) in the town of Londonderry, Windham County, Vermont, United States. As of the 2020 census, it had a population of 147.[2] The center of the village comprises the South Londonderry Village Historic District.
The CDP is in northwestern Windham County, in the south-central part of the town of Londonderry. It sits on both sides of the West River, a southeast-flowing tributary of the Connecticut River. Vermont Route 100 passes through the community, leading north to Londonderry village and south 9miles to Jamaica.