John Carney formally submitted paperwork to launch a bid to be Mayor of Wilmington, where he and his wife have lived for nearly 40 years.
Carney, who is a Democrat, has served as Governor since 2017 and cannot seek re-election to that office because of term limits.
The current Mayor, Mike Purzycki, has said he will not run.
Former State Treasurer Velda Jones Potter is also running as a Democrat.
The primary is September 10th.
A Republican has not yet entered the race.