Janet Stewart, Lady Fleming, called la Belle Écossaise, was a Scottish courtier. She 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'Angoulême. Her daughter, Mary Fleming, was one of the young queen's "Four Marys".

Mary, Queen of Scots, also known as Mary Stuart or Mary I of Scotland, was Queen of Scotland from 14 December 1542 until her forced abdication in 1567.