M. A. Hanna Company
| Industry | Iron Ore Processing |
|---|---|
| Founded | Mahoning Valley 1840 |
| Founder | Daniel F. Rhodes Marcus Hanna |
| Fate | Merged with Geon Company, August 2000, to form PolyOne Corporation |
| Headquarters | , |
Number of employees | 7,149 |
| Parent | PolyOne Corporation |
| Subsidiaries | Hanna Coal & Ore Company (liquidized 1965) |
M. A. Hanna Company was an iron ore processing company located in Cleveland, Ohio, United States.