The 1998 Sioux Falls mayoral election took place on April 14, 1998. Incumbent Mayor Gary W. Hanson, who was first elected in 1994, ran for re-election to a second term. He was challenged by former City Councilmember Anne Hajek and County Commissioner Robert Kolbe. Hanson won re-election and avoided a runoff election, winning 55 percent of the vote to Hajek's 37 percent and Kolbe's 8 percent.
