Sarah Greville, Countess of Warwick (4 February 1786 – 30 January 1851), formerly Lady Sarah Elizabeth Greville and Lady Monson, was the wife of Henry Greville, 3rd Earl of Warwick. Lady Sarah was the daughter of John Savile, 2nd Earl of Mexborough in the Irish peerage, and his wife, the former Elizabeth Stephenson. The family home was at Methley Park, near Leeds. Her mother, the Countess of Mexborough, died in 1821. Lady Sarah's elder brother, John, known as Viscount Pollington, served as MP for Pontefract and became the 3rd Earl on the death of their father in 1830.