Izabella Poniatowska | |
|---|---|
 Portrait by Marcello Bacciarelli | |
| Born | 1 July 1730 Wołczyn, Polish–Lithuanian Commonwealth |
| Died | 14 February 1808 (aged 77) Białystok, Congress Poland |
| Noble family | Poniatowski |
| Spouse(s) | Jan Klemens Branicki Andrzej Mokronowski |
| Issue | none |
| Father | Stanisław Poniatowski |
| Mother | Konstancja Czartoryska |
Countess Izabella Poniatowska (1 July 1730 – 14 February 1808) was a Polish noblewoman, sister of king Stanisław August Poniatowski.