東斯拉夫人（俄文：Восточные славяне）原屬於斯拉夫語族群，後來轉變成俄羅斯人、烏剋蘭人和白俄羅斯人。俄國和烏剋蘭國內的人國籍繁多促使歷史和起源更加復雜。
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.