Z17 may refer to:5-Z17 or Farben chord, in ascending order C-G♯-B-E-A, used in Five Pieces for Orchestra by Arnold Schoenberg 6-Z17, the Forte number for the all-trichord hexachord, a unique hexachord that contains all twelve trichords German destroyer Z17 Diether von Roeder, Type 1936-class destroyer built for the Kriegsmarine in the late 1930s New South Wales Z17 class locomotive, a class of steam locomotive built for the New South Wales Government Railways of Australia Small nucleolar RNA Z17, non-coding RNA (ncRNA) molecule which functions in the biogenesis (modification) of other small nuclear RNAs (snRNAs)