Frances Teresa Stewart, Duchess of Richmond and Lennox (8 July 1647[1] – 15 October 1702) was a prominent member of the Court of the Restoration and famous for refusing to become a mistress of Charles II of England.

Frances was the daughter of Walter Stewart, a physician in Queen Henrietta Maria's court, and a distant relative of the royal family as the son of Lord Blantyre, and his wife, Sophia (née Carew).

Her beauty appeared to her contemporaries to be equaled only by her childish silliness; but her letters to her husband, preserved in the British Museum, are not devoid of good sense and feeling.

The king's infatuation was so great that when the queen's life was despaired of in 1663, it was reported that he intended to marry Stewart, and four years later he was considering the possibility of obtaining a divorce to enable him to make her his wife[4] because she had refused to become his mistress.

Samuel Pepys recorded in May 1668: (..)he is mighty hot upon the Duchess of Richmond; insomuch that, upon Sunday was seen, at night, after he had ordered his Guards and coach to be ready to carry him to the Park, he did, on a sudden, take a pair of oars or sculler, and all alone, or but one with him, go to Somersett House, and there, the garden-door not being open, himself clamber over the walls to make a visit to her, which is a horrid shame.