東斯拉夫人（俄文：Восточные славяне）原屬於斯拉夫語族群，來轉變成俄羅斯人、烏蘭人和白俄羅斯人。俄國和烏蘭國內的人國籍繁多促使歷史和起源更加雜。
The East Slavs are a Slavic ethnic group, the speakers of East Slavic languages. Formerly the main population of the medieval state of Kievan Rus, by the seventeenth century they evolved into the Russian, Ukrainian, and Belarusian peoples.