| Chamber: | Assembly |
| State: | New York |
| District: | 9 |
| Representative: | Michael Durso |
| Party: | Republican |
| Residence: | Massapequa Park |
| Democratic: | 27.8 |
| Republican: | 38.9 |
| Npp: | 27.4 |
| Percent White: | 82 |
| Percent Black: | 3 |
| Percent Hispanic: | 11 |
| Percent Asian: | 2 |
| Percent Native American: | 0 |
| Percent Pacific Islander: | 0 |
| Percent Other Race: | 0 |
| Population Year: | 2020 |
| Population: | 126,431 [1] |
| Registered: | 101,138[2] |
New York's 9th State Assembly district is one of the 150 districts in the New York State Assembly. It has been represented by Republican Michael Durso since 2021.
District 9 includes portions of Nassau and Suffolk counties. It includes portions of the towns of Oyster Bay, Babylon, and Islip, and the villages of Massapequa Park, Babylon, and Brightwaters. The district also includes the hamlets of South Farmingdale, Massapequa, West Babylon, West Islip, and portions of Fire Island and the Great South Bay.