Mieszko II the Fat | |
|---|---|
| Duke of Opole-Racibórz, Kalisz-Wieluń | |
 Mieszko II the Fat's seal, dated to 1245. | |
| Born | 1220 |
| Died | 22 October 1246 |
| Noble family | Silesian Piasts |
| Father | Casimir I of Opole |
| Mother | Viola of Bulgaria |
Mieszko II the Fat (Polish: Mieszko II Otyły) (c. 1220 – 22 October 1246) was a Duke of Opole-Racibórz from 1230 until his death, and Duke of Kalisz-Wieluń during 1234–1239 (with his brother as co-ruler).
He was the eldest son of Duke Casimir I of Opole by his wife Viola, probably a Bulgarian princess.