Beata Oxenstierna (1591 in Reval Castle – 16 March 1652), was a Swedish aristocrat and courtier. She served as överhovmästarinna to Christina, Queen of Sweden, from 1639 to 1647.

Beata Oxenstierna was born to Baron Erik Gabrielsson Oxenstierna (1540s–1594) and Bengta Gera. Her father had been a courtier to Princess Cecilia Vasa of Sweden, and governor in Swedish Livonia, and she was born in Reval in Livonia during his tenure as governor there. She served as maid of honor to the queen of Sweden, Christina of Holstein-Gottorp, in 1610–1613. In 1613, she married Erik Göransson Ulfsparre af Broxvik (1577–1631), but as was the custom at the Swedish nobility up until the late 18th century, she kept her name even after her marriage. Her spouse served as governor in Stegeborg 1615–18, Norrköping 1618–21, Kronoberg 1621–26, and Östergötland 1627–1631; Beata Oxenstierna was widowed in 1631.

On 2 February 1639, she was appointed överhovmästarinna (mistress of the Robes) to queen Christina.

After the death of the queen's foster mother and aunt Catherine of Sweden, Countess Palatine of Kleeburg, the Royal Regency Council under Axel Oxenstierna saw a need to appoint a new foster mother to the underage monarch (her mother being exiled), which resulted in a reorganization of the queen's household. In order to avoid the young queen from being dependent upon a single individual and favorite mother figure, the Royal Council decided to split the office of head lady-in-waiting (responsible for the queen's female courtiers) and the office royal governess (or foster mother) in four, with two women appointed to share each office. Accordingly, in 1639 Ebba Leijonhufvud and Christina Natt och Dag was appointed to share the position of royal governess and foster mother with the title Upptuktelse-Förestånderska ('Castigation Mistress'), while Beata Oxenstierna and Ebba Ryning was appointed to share the position of head lady-in-waiting, all four with the formal rank and title of Hovmastarinna.^[1]

This signified a permanent reorganization of the Swedish Royal Household: previously, there had been only one Mistress of the Robes with the title Hovmästarinna ('Court Mistress'), but now, Beata Oxenstierna was additionally given the newly invented title of Överhovmästarinna ('Chief Court Mistress'), and from the reign of Christina onward, there were to be one or two Hovmästarinna and one Överhovmästarinna at the Swedish Royal Court.

Ebba Leijonhufvud was the mother-in-law to the son of the Regent of the Guardian Government, Axel Oxenstierna, and Beata Oxenstierna and Ebba Ryning was also connected to the Oxenstierna Party, which is believed to have played a part in their appointments.^[2]

The Royal Council's method of giving queen Christina several foster mothers to avoid her forming an attachment to a single person seems to have been effective: Christina dies not mention her foster mothers directly in her memoirs and does not seem to have formed any attachment to either of them, nor do they seem to have played any part at court after their term in service ended. With some exceptions, such as Ebba Sparre, Lady Jane Ruthven and Louise van der Nooth, Christina did not show any interest in any her female courtiers whatsoever, and she generally mentions them in her memoirs only to compare herself favorably toward them by referring to herself as more masculine than them.^[3] In 1639 she mentions her attitude toward her ladies in waiting in regard to Beata Oxenstierna and her daughter, maid of honor Märta Ulfsparre: "The Mistress of the Robes Lady Beata Oxenstierna and her daughter arrived just now. The more of them that comes here the worse it is" [...] "I despised everyone in my surroundings, particularly the women of my household, from whom I could not stand the smallest reproach."^[4]

Beata Oxenstierna was described by a contemporary source as: "A charitable lady, who did much good at court".^[5]

Oxenstierna was granted two estates in 1646, and retired with a very large pension on 6 July 1647.

• Eva Österberg, ed. (1997). Jämmerdal & Fröjdesal. Kvinnor i stormaktstidens Sverige. Stockholm: Atlantis AB. ISBN 91-7486-355-X; p. 321
• Erik Petersson: Maktspelerskan: drottning Kristinas revolt (2011)
• Marie-Louise Rodén: Drottning Christina: en biografi (2008)