| Honorific Prefix: | The Most Honourable |
| The Marchioness of Exeter | |
| Birth Name: | Isabella Poyntz |
| Birth Date: | 6 March 1803 |
| Resting Place: | St Martin's Church, Stamford |
| Children: | Mary Ryder, Countess of Harrowby William Cecil, 3rd Marquess of Exeter Col. Lord Brownlow Cecil Commander Lord Edward Cecil Lord Adelbert Cecil Victoria Evans-Freke, Baroness Carbery |
| Parents: | William Stephen Poyntz Hon. Elizabeth Mary Browne |
Isabella Cecil, Marchioness of Exeter (6 March 1803 - 6 March 1879), formerly Isabella Poyntz, was the wife of Brownlow Cecil, 2nd Marquess of Exeter, and the mother of the 3rd Marquess.
She was the daughter of William Stephen Poyntz, a Liberal MP, and his wife, the former Hon. Elizabeth Mary Browne.[1] Isabella's sister, Elizabeth Georgina Poyntz, married Frederick Spencer, 4th Earl Spencer. Another sister, Frances Selina Isabella Poyntz, married Robert Cotton St. John Trefusis, 18th Baron Clinton, and, on his death, married Sir Horace Seymour, MP.[2] Two of their brothers were drowned in an accident in a boating accident in 1815.[3]
The Poyntz family had homes at Midgham House in Berkshire and Cowdray Park in West Sussex.
Isabella married the marquess in London on 12 May 1824.[4] Their children were:
The marquess died in 1867. Isabella died in 1879, aged 76, and was buried with her husband in the Cecil family chapel at St Martin's Church, Stamford.[6]