New Hampshire's 18th State Senate district is one of 24 districts in the New Hampshire Senate. It was represented by Democrat Donna Soucy, formerly the President of the New Hampshire Senate, from 2012 to 2024. Former NH State Representative, Republican Victoria Sullivan, defeated her on November 5, 2024. Victoria Sullivan was sworn in to represent NH Senate District 18 on December 4, 2024.
District 18 is based in Manchester, covering the city's 5th, 6th, 7th, 8th, and 9th wards as well as the nearby town of Litchfield, all in Hillsborough County.
The district overlaps with both New Hampshire's 1st congressional district and New Hampshire's 2nd congressional district.