| Chamber: | Assembly |
| State: | New York |
| District: | 4 |
| Representative: | Edward Flood |
| Party: | Republican |
| Residence: | Port Jefferson Station |
| Democratic: | 36.8 |
| Republican: | 28.1 |
| Npp: | 28.7 |
| Percent White: | 68 |
| Percent Black: | 6 |
| Percent Hispanic: | 14 |
| Percent Asian: | 9 |
| Percent Native American: | 0 |
| Percent Pacific Islander: | 0 |
| Percent Other Race: | 0 |
| Population: | 123,545[1] |
| Population Year: | 2020 |
| Registered: | 97,825[2] |
New York's 4th State Assembly district is one of the 150 districts in the New York State Assembly. It has been represented by Republican Edward Flood since 2023, defeating then 30-year incumbent Steven Englebright.
District 4 is in Suffolk County. The district includes portions of the town of Brookhaven including Belle Terre, Old Field, Poquott, and Port Jefferson. Stony Brook University is within this district.