O.N.A. (1995–2003) was a Polish hard rock band formed by two former members of band Kombi: Grzegorz Skawiński (guitar), Waldemar Tkaczyk (bass) and a drummer Zbigniew Kraszewski, a keyboarder Wojciech Horny and a vocalist Agnieszka Chylińska.
They released six critically acclaimed albums and a lot of hits such as Kiedy powiem sobie dość, Znalazłam, Drzwi, Niekochana.
They disbanded in 2003 because of difference of artistic visions. Skawiński and Tkaczyk reactivated Kombi (under a new name KombII), A. .
