Seymour Dorothy Fleming (5 October 1758 – 9 September 1818), styled Lady Worsley from 1775 to 1805, was a member of the British gentry, notable for her involvement in a high-profile criminal conversation trial.

Lady Worsley turned the suit in her favour with scandalous revelations and the aid of past and present lovers; and questioned the legal status of her husband.

Seymour was forced to become a professional mistress or demimondaine and live off the donations of rich men in order to survive, joining other upper-class women in a similar position in the New Female Coterie.

In 1788, she and her new lover, the composer, conductor and champion fencer Joseph Bologne, the Chevalier de Saint-Georges, returned to England, and her estranged husband entered into articles of separation, on the condition she spend four years in exile in France.

[12] Eight months before the expiration of this exile, she was unable to leave France because of the events of the French Revolution and she was probably imprisoned during the Reign of Terror,[13] meaning she was abroad on the death of her and Worsley's son in 1795.

[14] On Worsley's death in 1805,[15] her £70,000 jointure reverted to her and just over a month later, on 12 September, at the age of 47 she married 26-year-old[16] newfound lover John Lewis Cuchet (d. 1836) at Farnham.