| Robert A. Johnson | |
| Office3: | Member of the South Dakota Senate for the 22nd district |
| Term3: | 1957 - 1962 |
| Birth Date: | 29 September 1921 |
| Birth Place: | Chicago, Illinois |
| Death Place: | Groton, South Dakota |
| Party: | Democratic |
| Profession: | insurance agent, farmer |
Robert A. Johnson (September 29, 1921 – December 11, 2014) was an American politician in the state of South Dakota. He was a member of the South Dakota State Senate.[1] Born in Chicago, Illinois, Johnson grew up on a farm in Groton, South Dakota. He was an alumnus of South Dakota State University and was a farmer and insurance agent.[2] He died on December 11, 2014.[3]