Ebba Gustavsdotter Stenbock (died 1614, in Finland) was a Swedish noble. She led the defense of the stronghold Turku Castle for the loyalist of Sigismund III Vasa during the Siege by Charles IX of Sweden in succession of her spouse Clas Eriksson Fleming, (1530-1597), governor of Finland. The sister of queen Katarina Stenbock, she married Clas Eriksson Fleming, (1530-1597), governor of Finland, in 1573.
Ebba Stenbock was the daughter of riksråd and Brita Eriksdotter Leijonhufvud, and the sister of Queen Catherine Stenbock. She was the niece of Queen Margareta Leijonhufvud, and thereby the cousin of the royal children of that marriage, including the future John III of Sweden and Charles IX of Sweden. In 1573, she married Clas Eriksson Fleming in the house of her sister, the Queen Dowager in Stockholm, and moved with him to Finland. She had three children during her marriage: the daughters Katarina, Hebla and Margareta, and her son Johan Fleming. In 1594, her spouse was appointed Governor-General of Finland.
Ebba Stenbock was noted for her fearless conduct toward Duke Charles. In the civil war the erupted in 1595 when Sigismund III Vasa was challenged by his uncle, the future Charles IX of Sweden, her spouse was one of the strongest supporters of Sigismund III Vasa and opposed to Charles IX of Sweden, and held the Swedish province of Finland against Duke Charles. In parallel, the Cudgel War erupted in Finland in 1596.