The city of St. Louis, Missouri, held nonpartisan primaries for the Board of Aldermen on March 7, 2023. All 14 seats on the board and the seat of the president of the board were up for election. The top two candidates in each primary advanced to an April 4 general election.
The 2023 primary was the first to take place under a new ward system that reduced the number of seats on the board from 28 to 14. The reduction in board size was part of Proposition R, a charter amendment passed by voters in 2012 that took effect on Jan. 1, 2022. In accordance with Proposition R, the board passed new ward maps in 2021.
Eighteen incumbents, including the board president, filed to run for re-election in the downsized board. Fourteen advanced to the general election. Four were defeated in the primary and did not advance to the general election.
