Alexandra (Polish: Aleksandra, Lithuanian: Aleksandra; died 20 April 1434 in Płock) was the youngest daughter of Algirdas, Grand Duke of Lithuania, and his second wife, Uliana of Tver. Though Alexandra's exact date of birth is not known, it is thought that she was born in the late 1360s or early 1370s.
In 1387 Alexandra married Siemowit IV, Duke of Masovia. The marriage followed Union of Krewo when Siemowit IV agreed not to rival Grand Duke of Lithuania Jogaila (brother of Alexandra) and to support him as the new King of Poland. Alexandra's and Siemowit's daughter Cymburgis married Ernest, Duke of Austria in 1412.
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On December 12, 1385, few months after the Union of Krewo, Siemowit IV, Duke of Masovia, reached a compromise with Jadwiga of Poland and her intended consort king Jogaila, Alexandra's brother. Siemowit IV agreed to cease his rival claims to the Kingdom of Poland, pay homage to Jadwiga and Jogaila, and to assume position of a hereditary vassal to the Polish Crown in exchange for 10,000 Prague groschen and fief Duchy of Belz. The agreement was solidified by marriage of Siemowit IV and Alexandra in 1387. Alexandra died and was buried in Płock. Her final resting place is likely a church of the Dominican Order.
Karol Piotrowicz, w: Polski Słownik Biograficzny/ Polish Biographical Dictionary. T. 1. Kraków: Polska Akademia Umiejętności – Skład Główny w Księgarniach Gebethnera i Wolffa, 1935, p. 66–67Marek, Miroslav. "Genealogy of the House of Gediminas". Genealogy.EU. http://genealogy.euweb.cz/jagelo/jagelo.html.Marek, Miroslav. "Genealogy of the House of Piast". Genealogy.EU. http://genealogy.euweb.cz/piast/piast3.html#Z4.
- 1368 Vilnius, Lithuania
- Uliana Aleksandrovna of Tver (c1325-1392)
- Algirdas of Lithuania (c1296-1377)
- Siemowit IV of Mazovia (c1353-1426)
Alexandra (late 1360s or early 1370s, Vilnius – 20 April 1434, Płońsk)  was the youngest daughter of Grand Duke of Lithuania Algirdas and his second wife Uliana of Tver. 
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The Baltic Nations and Europe: Estonia, Latvia and Lithuania in the Twentieth Century , 1991. Krickus, Richard J. Showdown: The Lithuanian Rebellion and the Breakup of the Soviet Empire , 1997. LaFont, Suzanne. Women in Transition: Voices from Lithuania , 1998. Lithuanian Institute of Philosophy and Sociology.