Nataliia Polonska-Vasylenko (Ukrainian: ??????? ?????????-?????????; 12 February 1884 in Kharkiv – 8 June 1973 in Dornstadt, near Ulm, West Germany) was one of the foremost Ukrainian historians of the 20th century.
She was a wife of the Ukrainian academician of history and statesman Mykola Vasylenko.