Charlotte Ashburnham, Countess of Ashburnham (née Percy; 3 June 1776 – 26 November 1862), was an English aristocrat. She was the second wife of George Ashburnham, 3rd Earl of Ashburnham, and the mother of the fourth earl.
Lady Charlotte was the eldest daughter of Algernon Percy, 1st Earl of Beverley, son of Hugh Percy, 1st Duke of Northumberland, and Beverley's wife, Isabella Burrell. Her brother was George Percy, 5th Duke of Northumberland.
Ashburnham's first marriage, to the Hon. Sophia Thynne, ended with her death in 1791. Of their four children, both sons and one daughter predeceased their father, leaving only Lady Elizabeth Sophia Ashburnham, who died unmarried on 13 March 1879, aged 92. As a result, it was the eldest surviving son of his second marriage who would inherit the earldom.
Lady Charlotte Percy married George Ashburnham, Viscount St Asaph (future Earl of Ashburnham) at Orwell Park, Ipswich, on 25 July 1795. They had 13 children:
The Hon. William Ashburnham (1797), who died in infancy
Bertram Ashburnham, 4th Earl of Ashburnham (1797–1878), who married Lady Katherine Charlotte Baillie and had children
The Hon. Percy Ashburnham (1799–1881), who married Esther By and had children
Lady Charlotte Susan Ashburnham (1801–1865), who died unmarried
Lady Theodosia Julia Ashburnham (1802–1887), who died unmarried
The Hon. Charles Ashburnham (1803–1848), who married Sarah Joanna Murray and had no children
Lady Georgiana Jemima Ashburnham (1805–1882), who married twice: first, to Henry Reveley Mitford (marriage dissolved), and second, to Hon. Francis George Molyneux. There were children from both marriages, including Bertram Freeman-Mitford, 1st Baron Redesdale, grandfather of the Mitford sisters