Sarah Anne Fane, Countess of Westmorland (née Child; 28 August 1764 – 9 November 1793) was an English noblewoman.

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.

[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.