Isabella Molyneux | |
|---|---|
| Countess of Sefton | |
 painting of Lady Isabella Stanhope by Thomas Gainsborough | |
| Born | Isabella Stanhope c. 1748 |
| Died | 29 January 1819 |
| Noble family | Stanhope (by birth) Molyneux (by marriage) |
| Spouse(s) | Charles Molyneux, 1st Earl of Sefton |
| Issue | William Molyneux, 2nd Earl of Sefton |
| Father | William Stanhope, 2nd Earl of Harrington |
| Mother | Lady Caroline FitzRoy |
Isabella Molyneux, Countess of Sefton, formerly Viscountess Molyneux, (née Lady Isabella Stanhope; c. 1748 – 29 January 1819) was a British peeress and society figure.