Martha Leijonhufvud, Swedish noble (died 1584)

Martha Eriksdotter Leijonhufvud, known as Kung Märta, was a politically active Swedish noblewoman. She was the sister of Queen Margaret Leijonhufvud and sister-in-law of King Gustav I of Sweden: she was also the maternal aunt of Queen Catherine Stenbock and the daughter-in-law of the regent Christina Gyllenstierna. In 1568, she financed the deposition of King Eric XIV of Sweden, which placed her nephew John III of Sweden on the throne.