| Oscar C. Hathaway | |
| State: | Wisconsin |
| State Senate: | Wisconsin |
| District: | 16th |
| Term Start: | January 3, 1876 |
| Term End: | January 5, 1880 |
| Predecessor: | John C. Holloway |
| Successor: | George W. Ryland |
| Party: | Republican |
| Birth Date: | 1 March 1833 |
| Birth Place: | Swanton, Vermont, U.S. |
| Death Place: | Exeter, California, U.S. |
| Restingplace: | Home of Peace Cemetery, |
| Spouse: | Mary Jane Hodge |
| Occupation: | Miner, businessman |
Oscar Clark Hathaway (March 1, 1833November 1, 1909) was an American miner, ore merchant, and Republican politician. He served four years in the Wisconsin State Senate, representing Grant County.
Hathaway was born on March 1, 1833, in Swanton (town), Vermont.[1] He moved to Wisconsin in 1853, and engaged in iron manufacturing in Mayville, Wisconsin, and lead mining in Beetown, Wisconsin.
He died in Exeter, California, on November 1, 1909.[2] He was buried at Home of Peace Cemetery in Porterville, California.
A Republican, Hathaway was Chairman of the Town Board of Beetown in 1872 and 1873. He represented the 16th District in the State Senate during the 1876, 1877, 1878, and 1879 sessions.[3]