| Official Name: | Topstone, Connecticut |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Connecticut#USA |
| Pushpin Label: | Topstone |
| Coordinates: | 41.2961°N -73.4486°W |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Name1: | Connecticut |
| Subdivision Type2: | County |
| Subdivision Name2: | Fairfield |
| Subdivision Type3: | Town |
| Subdivision Name3: | Redding |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.48 |
| Area Land Km2: | 0.48 |
| Area Water Km2: | 0.0 |
| Population As Of: | 2020 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 460 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 06896 (Redding) |
| Area Code: | 203/475 |
| Blank Name: | FIPS code |
| Blank Info: | 09-76400 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2805972 |
Topstone is a census-designated place (CDP) in the town of Redding, Fairfield County, Connecticut, United States. It is on the west side of the town and is bordered to the west by the town of Ridgefield.
Topstone was first listed as a CDP prior to the 2020 census.