The 2024 Texas's 18th congressional district special election was a special election that was held on November 5, 2024, to choose a new member of the U.S. House of Representatives. The seat became vacant when incumbent Rep. Sheila Jackson Lee died on July 19, 2024.
The special election only filled the remainder of Jackson Lee's unexpired term, from November 2024 until January 2025. Harris County Democratic party precinct chairs convened on August 13 to nominate former Houston mayor Sylvester Turner as a replacement on the ballot in the general election, which took place the same day as the special election and decided a congressperson for the new term beginning in January 2025. Upon being selected as the nominee, Turner chose not to run in the special election and endorsed Erica Lee Carter, the daughter of Jackson Lee.
Candidates had until August 22 to declare their candidacy in the all-party special election. If no candidate received a majority of the vote, a runoff would have been held on a later date. As a deeply blue urban district, this race was considered safe for Democrats.