Princess Aleksandra of Estonia, Countess of Viljandi (Aleksandra Karina Dagmar Margot Liisbet; b. 29 May 1979) is the third child and second daughter of Diana I of Estonia and Andreas, Prince Consort of Estonia. She stands third in the line of succession to the Estonian throne, a position that she acquired after the death of her grandfather Kristofer II of Estonia in 2000. She is preceded by her brother, Crown Prince Kristofer of Estonia, Duke of Tallinn and her sister Princess Johanna, Countess of Tartu. Her younger sister Princess Helena, Countess of Rakvere, is the only member of her immediate family to follow her in the line of succession.