Esther Acklom (1788–11 June 1818), also known as Esther Spencer, Viscountess Althorp, was a British heiress and socialite most well known for her social flirtations. Born the only child of Richard Acklom of Wiseton Hall, Nottinghamshire, and his wife Elizabeth, Acklom found great success and popularity in London social circles because of her wealth and good humour. She quickly gained the reputation of a flirt, turning down a large amount of marriage proposals, including those of James, Lord Lindsay, naval officer , and Henry, Lord Glentworth, the heir of Lord Limerick.