Vyacheslav, also transliterated Viacheslav or Viatcheslav (Russian: Вячеслав, romanized: Vyacheslav [vʲɪtɕɪˈslaf]; Ukrainian: В'ячеслав, romanized: Viacheslav [u̯jɐtʃeˈslɑu̯]), is a Russian and Ukrainian masculine given name.
It is the equivalent of Belarusian Вячаслаў/Вацлаў (transliterated Viačaslaŭ/Vaclaŭ, or Viachaslau/Vaclau), Croatian Vjenceslav, Czech Václav, Polish Wacław and Więcesław — Latinised as Wenceslaus.
It is a Slavic dithematic name (that is, composed of two lexemes) derived from the Slavic words vyache, "great(er)", and slava, "glory, fame".
Common short forms are Slava, Slavik.
Notable people with the given name Vyacheslav, Viacheslav or Viatcheslav include: