| Cotton Hayden Allen | |
| Office1: | 31st Mayor of Columbus |
| Term Start1: | 1895 |
| Term End1: | 1896 |
| Predecessor1: | George J. Karb |
| Successor1: | Samuel L. Black |
| Party: | Democratic |
| Profession: | Mayor Businessman |
| Birth Date: | 1834 |
| Birth Place: | Auburn, New York |
| Death Date: | January 26, 1900 |
Cotton Hayden Allen (1834–January 26, 1900) was the 31st mayor of Columbus, Ohio and the 28th person to serve in that office. He served Columbus for one term. His successor, Samuel L. Black, took office in 1897. He died in 1900.