Janet Stewart, Lady Fleming (17 July 1502 – 20 February 1562), called la Belle Écossaise (French for "the Beautiful Scotswoman"), was an illegitimate daughter of King James IV of Scotland who served as governess to her half-niece Mary, Queen of Scots.
Janet was briefly a mistress of King Henry II of France, by whom she had a legitimated son: Henri d'AngoulĂªme.
Her daughter, Mary Fleming, was one of the young queen's "Four Marys".