Amelia Osborne, Marchioness of Carmarthen

Amelia, Marchioness of Carmarthen
Amelia Osborne, painted by François-Hubert Drouais
Born	Lady Amelia Darcy (1754-10-12)12 October 1754
Died	27 January 1784(1784-01-27) (aged 29)
Spouses	Francis Osborne, Marquess of Carmarthen ​ ​ (m. 1773; div. 1779)​ John "Mad Jack" Byron ​ ​ (m. 1779)​
Children	George Osborne, 6th Duke of Leeds Mary Pelham, Countess of Chichester Francis Osborne, 1st Baron Godolphin Augusta Leigh
Parent(s)	Robert Darcy, 4th Earl of Holderness Mary Doublet

Amelia Osborne, Marchioness of Carmarthen, 12th Baroness Darcy de Knayth, 9th Baroness Conyers, 5th Countess of Mértola (née Darcy; 12 October 1754 – 27 January 1784), was a British peer and a Portuguese countess.