Uliana Alexandrovna of Tver () (ca. 1325 – autumn 1392) was a daughter of Grand PrinceAlexander of Tver and Anastasia of Halych, and second wife of Grand Prince of Lithuania Algirdas. After the death of her husband Uliana became a nun under the name Marina. She died after 1392.
In 1349 Algirdas the Grand Prince of Lithuania sent an embassy to the Golden Horde, proposing to khanJani Beg to form an alliance against Prince Simon of Moscow; but this proposal was not accepted. Then Algirdas in 1350 concluded peace with Simon and was married for a second time to his sister-in-law (Uliana's sister Maria was married to Simon), princess Uliana of Tver.
Uliana and Algirdas had thirteen children: six sons and seven daughters. Their oldest son Jogaila inherited the throne and became Grand Duke of Lithuania. In 1386 he was also crowned as King of Poland.