The Principality of Polotsk (obsolete spelling: Polock; ; ), also known as the Duchy of Polotsk or Polotskian Rus', was a medieval principality. The origin and date of the establishment of the state are uncertain. Chronicles of Kievan Rus' mention Polotsk being conquered by Vladimir the Great, and thereafter it became associated with Kievan Rus' and its ruling Rurikids.

The principality was supposedly