Marie-Jeanne Meyer (born 1942) is a French billionaire and member of the Louis Dreyfus family.

Her brother is Robert Louis-Dreyfus and her sister is Monique Roosmale Nepveu.

[3] She is the great granddaughter of Léopold Louis-Dreyfus, founder of the Louis-Dreyfus Group, which had begun buying and selling wheat in the Alsace region a century earlier, and rapidly diversified into shipping, oil and other commodities.

[5] After the death of her brother Robert, his widow and second wife Margarita Louis-Dreyfus (b: Rita Bogdanova), inherited 60% of the Louis Dreyfus Group[6] (later increased to 65% in 2012).

[7] As of 2013, Marie-Jeanne owned 12.5% of the Louis Dreyfus Group making her a billionaire.