Margaret of the Mark

Margaret of the Mark (died 1409) was a daughter of Count Adolf II of the Mark and Margaret of Cleves. Betrothed as a child to the future John I of Nassau-Siegen in 1343, she married him in 1357. The marriage brought John revenues in the County of the Mark and claims to Cleves.

She bore four sons, Adolf I, John II, Engelbert I and John III. They jointly succeeded their father as counts of Nassau-Siegen in 1416.