Margaret of Austria (25 December 1584 – 3 October 1611) was Queen of Spain and Portugal by her marriage to King Philip III & II.

Margaret was the daughter of Archduke Charles II of Austria and Maria Anna of Bavaria and thus the paternal granddaughter of the Holy Roman Emperor Ferdinand I.

Two of her sisters, Anna and Constance, through their subsequent marriages to King Sigismund III Vasa, became Queens of Poland.

[3] They were successful, for example, in convincing Philip to provide financial support to Ferdinand II, Holy Roman Emperor.

[1] The pro-Austrian camp at the Spanish court was opposed by the Duke of Lerma, the King's chief minister, who argued that Spain should pursue her own course of action independently of religious or dynastic ties.