| Official Name: | Darien Downtown, Connecticut |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Connecticut#USA |
| Pushpin Label: | Darien Downtown |
| Coordinates: | 41.0767°N -73.4703°W |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Name1: | Connecticut |
| Subdivision Type2: | County |
| Subdivision Name2: | Fairfield |
| Subdivision Type3: | Town |
| Subdivision Name3: | Darien |
| Area Footnotes: | [1] |
| Area Total Km2: | 2.08 |
| Area Land Km2: | 2.04 |
| Area Water Km2: | 0.04 |
| Population As Of: | 2020 |
| Population Density Km2: | = |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 60 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 06820 |
| Area Code: | 203/475 |
| Blank Name: | FIPS code |
| Blank Info: | 09-18936 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2805053 |
Darien Downtown is a census-designated place (CDP) in the town of Darien, Fairfield County, Connecticut, United States. It represents the built-up center of town around the intersections of U.S. Route 1 (Boston Post Road), Connecticut Route 124 (Mansfield Avenue), and Connecticut Route 136 (Tokeneke Road). Interstate 95 passes through the southern part of the CDP, with access from Exit 11 (Route 1) and Exit 12 (Route 136). It was first listed as a CDP prior to the 2020 census.