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Casimir I | |
|---|---|
| Duke of Opole-Racibórz | |
 Seal of Casimir I, 1226 | |
| Born | c. 1179/80 |
| Died | 13 May 1230 |
| Buried | Czarnowąsy monastery |
| Noble family | Silesian Piasts |
| Spouse(s) | Viola, Duchess of Opole |
| Issue | Mieszko II the Fat Władysław Wenzeslawa Euphrosyne |
| Father | Mieszko I Tanglefoot |
| Mother | Ludmilla |
Casimir I of Opole (Polish: Kazimierz I opolski; c. 1178/79 – 13 May 1230), a member of the Piast dynasty, was a Silesian duke of Opole and Racibórz from 1211 until his death.