Vasilko Sviatoslavich of Polotsk

Vasilko Sviatoslavich (died 1144), son of Sviatoslav Vseslavich of Vitebsk and grandson of Vseslav the Seer, was prince of Polotsk from 1132. In 1129 he was among the Polotsk princes exiled to Byzantium by Grand Prince Mstislav the Great, possibly serving Emperor John II Komnenos as a commander. He returned c. 1131, and in 1132 Polotsk expelled Sviatopolk Mstislavich and invited him to rule.

In 1138 he escorted Vsevolod Mstislavich, expelled from Novgorod, with honour and swore to him by kissing the cross. He held Polotsk until his death in 1144, at peace with the sons of Mstislav, and in 1143 married his daughter to Sviatoslav Vsevolodovich.