thumb|The Vyatichi tribes pay tribute to [[Sviatoslav I Igorevich|Prince Svyatoslav I Igorevich (966). <br><small>Miniature from the Radziwiłł Letopis, late 15th century.</small>]]
The Vyatichi, Viatichi () or Vyatichs were a tribe of Early East Slavs who inhabited regions around the Oka, Moskva and Don rivers.
The Vyatichi had for a long time no princes, but the social structure was characterized by democracy and self-government. Like various other Slavic tribes, the Vyatichi people built kurgans on territory which belongs now to the modern Russian state. The 12th-century Primary Chronicle recorded that the Vyatichi, Radimichs and Severians "had the same customs", all lived violent lifestyles, "burned their dead and preserved the ashes in urns set upon posts beside the highways", and they did not enter monogamous marriages but practiced polygamy, specifically polygyny, instead.
The Primary Chronicle names a certain tribal leader Vyatko as the forefather of the tribe, who was a Lyakh brother of Radim from whom emerged the Radimichs. The Vyatichi were mainly engaged in farming and cattle-breeding. Between the 9th and 10th centuries, the Vyatichi paid tribute to the Khazars and later to Kievan princes.