| Official Name: | Old Hill, Connecticut |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Connecticut#USA |
| Pushpin Label: | Old Hill |
| Coordinates: | 41.1497°N -73.3792°W |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Name1: | Connecticut |
| Subdivision Type2: | County |
| Subdivision Name2: | Fairfield |
| Subdivision Type3: | Town |
| Subdivision Name3: | Westport |
| Area Footnotes: | [1] |
| Area Total Km2: | 5.68 |
| Area Land Km2: | 5.59 |
| Area Water Km2: | 0.09 |
| Population As Of: | 2020 |
| Population Density Km2: | = |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 120 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 06880 (Westport) |
| Area Code: | 203/475 |
| Blank Name: | FIPS code |
| Blank Info: | 09-56935 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2805090 |
Old Hill is a census-designated place (CDP) in the town of Westport, Fairfield County, Connecticut, United States. It is in the western part of the town and is bordered to the west by the city of Norwalk.
Old Hill was first listed as a CDP prior to the 2020 census.