| Honorific Prefix: | The Right Honourable |
| The Countess of Westmorland | |
| Birth Name: | Sarah Anne Child |
| Birth Date: | 28 August 1764 |
| Death Place: | Phoenix Park, Dublin |
| Parents: | Robert Child Sarah Jodrell |
| Children: | 5 |
Sarah Anne Fane, Countess of Westmorland (Child; 28 August 1764 - 9 November 1793) was an English noblewoman.
She was the only child of Robert Child, the owner of Osterley Park and principal shareholder in the banking firm Child & Co, and Sarah Child. She married John Fane, 10th Earl of Westmorland, on 20 May 1782 at Gretna Green after they eloped together. Her parents were dissatisfied with the match: Sarah Anne being an only child, her father wanted her to marry a commoner who would take the Child name; but Sarah Anne told her mother, "A bird in the hand is worth two in the bush."[1] Her father would leave no capital to her or any eldest child,[2] leaving his house and fortune to the (any) second child of Sarah Anne, instead of the likely Westmorland primogeniture heir-to-be.[1] A second marriage ceremony took place at Apethorpe, Northamptonshire on 7 June 1782.[3] She died of a fever at Phoenix Park, Dublin on 9 November, 1793.[4]
Sarah Anne and the earl's surviving children were:
As only one son of the marriage survived, most of Child's fortune eventually went to his eldest granddaughter, Lady Sarah Sophia.[5]
Seven years after Sarah's death, the Earl of Westmorland married Jane Saunders, an heiress, and had further children.