O.N.A. was a Polish rock/Heavy Metal band, formed in 1994.
The band was formed by musicians who had previously played together: Skawiński and Traczyk were in a band named Kombi; Kraszewski previously played in Kombi and TSA.
Grzegorz Skawiński was the leader of the band and the composer. Agnieszka Chylińska was the lyric writer and the vocalist.