This article describes the ancient contacts and relationships of ancient Mongols with the ancestors of Tungus peoples and Koreans. An analysis of the available materials suggests that the Tungus tribes in the late Bronze Age and early Iron Age lived in South Manchuria and the surrounding areas of Inner Mongolia. Linguists suggested that there was a unified ancient ethnic group, consisting of the Tungus-Manchu and Mongolian ancestors. The arguments of this article allow us to consider common origins in the formation of ancient Mongols, Tungus peoples, Koreans. The author suggested that in ancient times in the lands of southern Manchuria and Inner Mongolia these peoples were closely related ethnic groups. Culture and traditions of the ancient Mongols also developed on this territory in close connection with Tungus-Manchus, Korean ancestors and in contacts with Chinese culture.