东斯拉夫人（俄文：Восточные славяне）原属于斯拉夫语族群，后来转变成俄罗斯人、乌克兰人和白俄罗斯人。俄国和乌克兰国内的人国籍繁多促使历史和起源更加复杂。
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.