The 2003 Jacksonville mayoral election took place on May 13, 2003, following a primary election on April 15, 2003. Incumbent Republican Mayor John Delaney was unable to seek a third consecutive term because of term limits. Jacksonville Sheriff Nat Glover, a Democrat, placed first in the primary election with 28 percent of the vote. Republican businessman John Peyton narrowly defeated city official Mike Weinstein to advance to the runoff against Glover, winning 24 percent of the vote to Weinstein's 22 percent. In the runoff election, Peyton defeated Glover in a landslide, winning 58-42 percent.