Biernacki (feminine Biernacka) is a Polish surname, it may refer to:
Edmund Biernacki (1866–1911), Polish physician Marek Biernacki (born 1959), Polish politician Marianna Biernacka (1888–1943), Polish martyr of World War II Mieczysław Biernacki (1891–1959), Polish mathematical chemist Stefan Dąb-Biernacki (1890–1959), Polish general Wacław Kostek-Biernacki (1882–1957), Polish politician and writer
See also Bernacki