| Reynolds J. Kost | |
| State Senate: | Wyoming |
| District: | 19th |
| Term Start: | January 7, 2019 |
| Term End: | 2023 |
| Predecessor: | R. Ray Peterson |
| Successor: | Dan Laursen |
| Birth Place: | Greybull, Wyoming |
| Party: | Republican |
| Spouse: | Caroline S. Kost |
| Children: | 2 |
R.J. Kost is an American politician who currently served in the Wyoming Senate representing the 19th district as a member of the Republican Party from 2019 to 2023.
In 2018, Kost defeated incumbent Senator R. Ray Peterson with 53.80% of the vote.[1] He serves on the Agriculture, State and Public Lands & Water Resources, Judiciary, School Facilities, and Interstate Compact for Adult Offender Supervision committees.[2]