New York's 4th State Senate district is one of 63 districts in the New York State Senate. It has been represented by Democrat Monica Martinez since 2023.
District 4 is in Suffolk County on Long Island, including portions of Bay Shore, Brentwood, Central Islip, Deer Park, Islandia, North Babylon, West Babylon and Wyandanch.
The district overlaps with New York's 1st and 2nd congressional districts, and with the 5th, 6th, 7th, 9th, 11th, and 12th districts of the New York State Assembly.