| Mark Matthiesen | |
| State House: | Missouri |
| State: | Missouri |
| District: | 107th |
| Term Start: | January 2023 |
| Preceded: | Nick Schroer |
| State House1: | Missouri |
| State1: | Missouri |
| District1: | 70th |
| Term Start1: | January 2017 |
| Term End1: | January 2019 |
| Preceded1: | Bill Otto |
| Succeeded1: | Paula Brown |
| Party: | Republican |
| Birth Place: | Fayetteville, Arkansas, U.S. |
| Alma Mater: | Missouri State University |
| Residence: | O'Fallon, Missouri, U.S. |
| Children: | 1 |
Mark Matthiesen is an American politician from the state of Missouri. A Republican, he was elected in November 2016 from the 70th district of the Missouri House of Representatives, served from January 2017 to January 2019, then was elected in November 2022 from the 107th district.
Matthiesen was born in Fayetteville, Arkansas. He graduated from Washington High School in Washington, Missouri, in 1994. Additional education resulted in an associate degree in accounting from Florida State College at Jacksonville in 1999 and a bachelor's degree in hospitality management from Missouri State University in 2005. He is a licensed real estate agent, and in response to a 2022 candidate survey said he had worked in the hospitality industry for 20 years.
The 70th district that Matthiesen represented from 2017 included parts of Saint Charles and Saint Louis counties, spanning between Chesterfield and Florissant. In 2018, Matthiesen lost re-election to Democratic candidate Paula Brown by less than a one percent margin and only 111 votes, with nearly 200 votes going to a third-party candidate. In 2022, he was elected from another St. Charles county district that includes much of the city of O'Fallon.[1] [2] He was unopposed in the 2024 Republican primary.[3]