| Election Name: | 1998 Missouri State Auditor election |
| Country: | Missouri |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1994 Missouri State Auditor election |
| Previous Year: | 1994 |
| Next Election: | 2002 Missouri State Auditor election |
| Next Year: | 2002 |
| Election Date: | 3 November 1998 |
| Nominee1: | Claire McCaskill |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 780,178 |
| Percentage1: | 50.30% |
| Nominee2: | Charles A. Pierce |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 719,653 |
| Percentage2: | 46.40% |
| State Auditor | |
| Before Election: | Margaret B. Kelly |
| Before Party: | Republican Party (United States) |
| After Election: | Claire McCaskill |
| After Party: | Democratic Party (United States) |
The 1998 Missouri State Auditor election was held on 3 November 1998 in order to elect the state auditor of Missouri. Democratic nominee and former member of the Missouri House of Representatives Claire McCaskill defeated Republican nominee Charles A. Pierce, Libertarian nominee Gerald R. Geier and Reform nominee and former member of the Missouri House of Representatives George D. Weber.[1]
On election day, 3 November 1998, Democratic nominee Claire McCaskill won the election by a margin of 60,525 votes against her foremost opponent Republican nominee Charles A. Pierce, thereby gaining Democratic control over the office of state auditor. McCaskill was sworn in as the 34th state auditor of Missouri on 3 January 1999.[2]