| Robert F. Ruth | |
| Office3: | Member of the South Dakota House of Representatives |
| Term3: | 1969 - 1970 |
| Birth Date: | 4 March 1921 |
| Party: | Republican |
| Profession: | Merchant |
Robert F. Ruth (March 4, 1921 – December 3, 2018) was an American politician in the state of South Dakota. He was a member of the South Dakota State Senate.[1] He served in the United States Navy and was a commander in the United States Naval Reserve. He was also a merchant.[2] He died in December 2018 at the age of 97, several months after the death of his wife Claramae.[3]