Jenny Zillhardt or Marguerite Valentine (16 March 1857 – February 1939) was a French painter.

She began studying painting in 1877 at the Académie Julian in Paris, alongside Louise Catherine Breslau and Marie Bashkirtseff.

[2] Zillhardt was part of the French female group of artists whose work was represented at the 1893 Chicago World's Fair, an exhibit in the Woman's Building.

[7] Her painting Régalez-vous mesdames was included in the 1905 work of British art historian Walter Shaw Sparrow, Women Painters of the World.

[2] She was the sister of Madeleine Zillhardt, model and companion of Louise Catherine Breslau.