| Gary D. Hanson | |
| State Senate: | South Dakota |
| State: | South Dakota |
| District: | 1st |
| Term Start: | 2004 |
| Term End: | 2010 |
| Succeeded: | Incumbent |
| Party: | Democrat |
| Birth Date: | 17 December 1949 |
| Birth Place: | Sisseton, South Dakota |
| Spouse: | Angela |
| Occupation: | farmer/rancher |
| Residence: | Sisseton, South Dakota |
Gary D. Hanson (born December 17, 1949) is a Democratic member of the South Dakota Senate, representing the 1st district from 2004 to 2010. Previously he was a member of the South Dakota House of Representatives from 1998 through 2004.