Kansas's 1st Senate district is one of 40 districts in the Kansas Senate. The district has been represented by Republican Craig Bowser since 2025.
District 1 is based in the northeastern corner of the state, covering all of Atchison, Brown, Doniphan, Jackson, Marshall, Nemaha, and Pottawatomie counties. Communities in the district include Atchison, Holton, Hiawatha, Sabetha, Seneca, Horton, Wathena, Troy, Elwood, and a small part of Manhattan.
The district overlaps with Kansas's 1st and 2nd congressional districts, and with the 51st, 61st, 62nd, 63rd, and 106th districts of the Kansas House of Representatives. It borders the states of Missouri and Nebraska.
The district includes all of Atchison, Brown, Doniphan, Jackson, and Nemaha counties, and portions of Jefferson, Leavenworth, and Marshall counties.