The 2025 Nassau County Legislature election was held on November 4, 2025, to elect the 19 legislators in Nassau County, New York, one from each of the county's legislative districts. The elections coincided with other elections in the county and state.
The Republican Party maintained their majority from the 2023 election, but lost a seat.
Prior to the election, the Westchester County Supreme Court issued a ruling declaring the previous legislature map to be void as it disproportionally benefitted the Republican Party. A new map was made, redrawing multiple districts and helping the Democrats gain the 14th district.