Valborg Eriksdotter (1545-1580), was the royal mistress of Magnus, Duke of Östergötland, between 1560 and 1567.
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She became the official mistress of Magnus in 1560, and followed him to Vadstena when he left court to reside at Vadstena Castle as duke of Ostrogothia.
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She also visited the court at Stockholm, and she is believed to be the unidentified royal mistress who were mentioned as a friend of Karin Månsdotter during the Sture Murders in 1567.
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In 1563, Magnus became mentally ill, and his brother, Eric XIV of Sweden, gave her many gifts to make her stay with Magnus during his illness.