2026 St. Charles County Executive election
The 2026 St. Charles County Executive election will be held on November 3, 2026, following party primaries on August 4, 2026. Incumbent County Executive Steve Ehlmann, who served in the position since 2007, announced in June 2023 that he would not seek a sixth term, but stated in August 2025 that he was reconsidering the decision, and announced in October 2025 that he was running for re-election.
Republican primary
Candidates
Announced
- Steve Ehlmann, incumbent County Executive
- Bill Eigel, former State Senator, 2024 Republican candidate for Governor
- Jason Law, Mayor of Lake St. Louis
Withdrew
- Mike Elam, Chairman of the County Council ''''
Declined
- Nick Guccione, Mayor of Wentzville ''''
Polling
| Poll source | Date administered | Sample size | Margin of error | Bill Eigel | Mike Elam | Nick Guccione | Jason Law | Undecided |
| Survey Missouri | August 19 & 25, 2025 | 335 | ± 3.5% | 39% | 7% | 11% | 9% | 34% |
| Survey Missouri | April 22–23, 2025 | 408 | ± 3.2% | 40% | 10% | 11.7% | 1.7% | 36.7% |