Lady Sarah Frederica Caroline Child-Villiers (12 August 1822 – 17 November 1853) was an English aristocrat from the Villiers family who married into the Hungarian House of Esterházy.

Her mother was one of the famously patronesses of Almack's, the most exclusive social club in London, and a leader of the ton during the Regency era.

[1] The memoirist Captain Gronow, who disliked her, called her "a theatrical tragedy queen", and considered her "ill-bred and inconceivably rude".

Her paternal grandmother, Frances Villiers, Countess of Jersey, was one of the more notorious mistresses of King George IV when he was Prince of Wales.

Lady Sarah developed consumption and sought cures in the spa towns of Ischl and Ems before returning to England in the hope her "native air" would heal her lungs.