| John Wiemann | |
| Office: | Speaker pro tempore of the Missouri House of Representatives |
| Term Start: | January 9, 2019 |
| Term End: | January 4, 2023 |
| Predecessor: | Elijah Haahr |
| Successor: | Mike Henderson |
| State House1: | Missouri |
| District1: | 103rd |
| Term Start1: | January 2015 |
| Term End1: | January 4, 2023 |
| Predecessor1: | Doug Funderburk |
| Successor1: | Dave Hinman |
| Birth Date: | 15 May 1967 |
| Birth Place: | St. Louis, Missouri, U.S. |
| Party: | Republican |
| Education: | East Central College University of Missouri, Columbia (BA, MHA) |
John D. Wiemann is an American politician who represented District 103 in the Missouri House of Representatives. A member of the Republican Party, he was first elected in November 2014,[1] [2] and re-elected to three more terms to January 2023. Wiemann served as the Speaker pro tempore of the Missouri House of Representatives from 2019 to 2023. He ran for an open 2022 seat in the second district of the state senate, though lost in the primary.[3]