| Chamber: | Assembly |
| State: | New York |
| District: | 3 |
| Representative: | Joe DeStefano |
| Party: | Republican |
| Residence: | Brookhaven |
New York's 3rd State Assembly district is one of the 150 districts in the New York State Assembly. It has been represented by Joe DeStefano since 2019.
District 3 is located entirely within Suffolk County. It includes portions of the town of Brookhaven, including the villages of Bellport, Mastic Beach, East Patchogue, Coram, Farmingville, Gordon Heights, Shirley, Medford, Middle Island, and Ridge.