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.