| Viscount FitzHardinge | |
| Creation Date: | 14 July 1663 |
| Subsidiary Titles: | Baron Berkeley, of Rathdowne |
| Status: | Extinct |
| Extinction Date: | 19 December 1712 |
| Motto: | PAUCA SUSPEXI PAUCIORA DEXPEXI (Few suspected, fewer bargained) |
Viscount Fitzhardinge is an extinct title in the Peerage of Ireland. It was created on 14 July 1663 for Charles Berkeley, later Earl of Falmouth, of the Bruton branch of the Berkeley family, with the subsidiary title of Baron Berkeley of Rathdowne, also in the Peerage of Ireland. It passed by special remainder to Charles' father, Charles, then to Maurice, elder brother of the first viscount, and then to their younger brother, John. The title became extinct on John's death in 1712.