Aleksandra Billewicz (Oleńka, Aleksandra Billewiczówna, later Kmicicowa) is a fictional character created by Henryk Sienkiewicz, appearing in the novel The Deluge as the main female protagonist. She is a wise Polish noblewoman, by the will of her grandfather engaged to Andrzej Kmicic.

In 1974 film she is portrayed by Małgorzata Braunek.