Emilia Butler, Countess of Ossory

Emilia Butler, Countess of Ossory (4 March 1635 (baptised) – 12 December 1688 (buried)), born Æmilia van Nassau-Beverweerd, was an Anglo-Dutch courtier.

Emilia was born in The Hague, the daughter of Lodewijk van Nassau, Lord of Beverweerd, the Governor of 's-Hertogenbosch, and his wife, Isabella, Countess of Hornes.

The countess was presented to Catherine of Braganza, the wife of Charles II of England upon her arrival in London and was appointed as lady-in-waiting to the queen at Hampton Court Palace.

During the outbreak of the plague (1665) the countess accompanied the queen and her household to the safety of Hampton Court, later removing to Oxford.

Lady Ossory served Queen Catherine for over twenty years, retiring from service after the death of Charles II (1685).