| J. Sam Marty | |
| State House: | South Dakota |
| District: | 28th (B) |
| Alongside: | Dean Schrempp |
| Term Start: | January 13, 2015 |
| Term End: | January 10, 2023 |
| Birth Date: | 8 November 1947 |
| Party: | Republican |
| Spouse: | Leah Marty |
| Profession: | Rancher |
| Residence: | Prairie City, South Dakota, U.S. |
| Children: | 5 |
John Samuel "Sam" Marty (born November 8, 1947) is an American politician. He served as a Republican member for the 28th district in the South Dakota House of Representatives starting in 2015.[1] [2] He left office on January 10, 2023.[3] He was unable to run for re-election in 2022 due to term limits.