Euphrosyne of Masovia
| Euphrosyne of Masovia | |
|---|---|
| Duchess consort of Oświęcim | |
| Reign | 1306 – between 5 December 1321 and 15 May 1324 |
| Born | 1292 |
| Died | 1328/1329 |
| Burial | |
| Spouse | Władysław of Oświęcim |
| Issue | Jan I the Scholastic Anna Daughter |
| House | Piast |
| Father | Bolesław II of Masovia |
| Mother | Kunigunde of Bohemia |
Euphrosyne of Masovia also known as Eufrozja (1292–1328/1329) was Duchess of Oświęcim by her marriage. She served in the regency of her son John, in the duchy of Oświęcim.