Saint Euphrosyne of Polotsk (or Polatsk, Polack) (Belarusian: ?????????? ????????; 1104–1167) was the granddaughter of a prince of Polotsk, Vseslav, and daughter of Prince Svyatoslav of Polotsk.
She has long been a popular Saint among Orthodox devotees, particularly those in Russia, Ukraine, and Belarus, with a traditional feast day of May 23.
In addition, since 1984, she has been one of the 15 patron saints of Belarus, whose lives are celebrated in the Belarusian Orthodox Church, on the first Sunday after Pentecost.