Istok is a village in the administrative district of Gmina Dubicze Cerkiewne, within Hajnówka County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Belarus.
According to the official website of the Gmina Dubicze Cerkiewne, the village of Istok was established before 1570. The name "Istok" is believed to be derived from local words meaning âÂÂslopeâ or âÂÂsmall streamâ (i.e., a spring or minor watercourse) in the Mazovian/Podlaskie dialect.