Oleksandra Mikhailovna Bilozerska-Kulish (Ukrainian: Олекса́ндра Михай́лівна Білозе́рська-Кулі́ш; 5 May 1828 – 6 July 1911), who commonly wrote under the pseudonym Hanna Barvinok, was a Ukrainian writer and folklorist. Considered one of the most important writers in Ukraine, she was the first female writer of modern Ukrainian literature and became a pioneer of ethnographic realism in Ukrainian writing.