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| Gerolama Orsini | |
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| Duchess consort of Parma and Piacenza | |
| Tenure | 19 August 1545 – 10 September 1547 |
| Born | 1504 Rome, Papal States |
| Died | 1569 Palazzo Farnese, Duchy of Parma and Piacenza |
| Spouse | Pier Luigi Farnese |
| Issue Detail | Cardinal Alessandro Vittoria, Duchess of Urbino Ottavio, Duke of Parma Orazio, Duke of Castro Cardinal Ranuccio |
| House | Orsini |
| Father | Lodovico Orsini |
| Mother | Giulia Conti |
Gerolama Orsini (1504–1569) sometimes Girolama Orsini was the Duchess of Parma as the wife of Pier Luigi Farnese, Duke of Parma. She served as Regent (Governor) of the Duchy of Castro in the name of her son Orazio, Duke of Castro between 1550 and 1553.[1]