| Official Name: | East Setauket, New York |
| Settlement Type: | Census-designated place |
| Mapsize: | 300px |
| Pushpin Map: | New York#USA |
| Pushpin Label: | East Setauket |
| Pushpin Label Position: | right |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | New York |
| Subdivision Type2: | County |
| Subdivision Name2: | Suffolk |
| Subdivision Type3: | Town |
| Subdivision Name3: | Brookhaven |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 6.08 |
| Area Land Sq Mi: | 6.02 |
| Area Water Sq Mi: | 0.06 |
| Area Total Km2: | 15.74 |
| Area Land Km2: | 15.60 |
| Area Water Km2: | 0.15 |
| Population As Of: | 2020 |
| Population Density Km2: | 705.18 |
| Timezone: | Eastern Time Zone |
| Utc Offset: | −05:00 |
| Utc Offset Dst: | −04:00 |
| Elevation Ft: | 20 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 11733 |
| Area Code: | 631/934 |
| Blank Name: | FIPS code |
| Blank Info: | 36-22964 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2805098 |
| Population Total: | 10998 |
| Unit Pref: | Imperial |
| Population Density Sq Mi: | 1826.30 |
East Setauket is a hamlet and census-designated place (CDP) on Long Island, in the town of Brookhaven, Suffolk County, New York, United States. It was first listed as a CDP prior to the 2020 census. Before that it was part of the Setauket-East Setauket CDP.
The community is in northwestern Suffolk County, in the northwest part of the town of Brookhaven. The East Setauket is bordered by Setauket to the northwest, Poquott to the north, Port Jefferson to the northeast, Port Jefferson Station to the east, Terryville to the southeast, South Setauket to the south, Stony Brook to the southwest, and Stony Brook University to the west.