| Robert O. Perrin | |
| Office: | President of the Greene County, Alabama, Board of Health |
| Term Start: | September 26, 1878 |
| Term End: | October 8, 1878 |
| Birth Name: | Robert Oliver Perrin |
| Birth Date: | 3 November 1823 |
| Birth Place: | Edgefield District, South Carolina, U.S. |
| Death Place: | Eutaw, Alabama, U.S. |
| Death Cause: | Heart disease |
| Resting Place: | Mesopotamia Cemetery, Eutaw, Alabama, U.S. |
| Resting Place Coordinates: | 32.8513°N -87.8991°W |
| Relations: | Abner M. Perrin (brother) |
| Allegiance: | Confederate States |
| Branch: | Confederate States Army |
| Branch Label: | Branch |
| Serviceyears: | 1861–1865 |
| Rank: | Colonel |
| Battles: | |
| Battles Label: | Battles |
Robert Oliver Perrin (November 3, 1823October 8, 1878) was an American physician who served as president of the Greene County, Alabama, Board of Health until his death in 1878.[1]
Perrin previously served as a senior officer of the Confederate States Army, commanding the 11th Mississippi Cavalry Regiment in the Western Theater of the American Civil War from 1863 until he resigned his commission in 1865.[2] He died on October 8, 1878, at his home in Eutaw, Alabama, of heart disease at the age of 54.[3]