| Robert W. Hayes Jr. | |
| State Senate: | South Carolina |
| State: | South Carolina |
| District: | 15th |
| Term: | 1991 - 2017 |
| Preceded: | James Madison Waddell, Jr. |
| Succeeded: | Wes Climer |
| Birth Date: | 19 December 1952 |
| Birth Place: | Spartanburg, South Carolina |
| Spouse: | Sarah Mellon Shurley |
| Profession: | Attorney |
| Party: | Republican |
| Office2: | Member of the South Carolina House of Representatives from the 46th district |
| Termend2: | 1991 |
| Termstart2: | 1985 |
| Successor2: | Gary Simrill |
| Succeeded2: | James Madison Waddell, Jr. |
| Preceded2: | John Calvin Hayes III |
Robert W. Hayes Jr. (born December 19, 1952) is a Republican member of the South Carolina Senate, who had represented the 15th district since 1991 until 2017. He was a member of the South Carolina House of Representatives from 1985 through 1991.