The Yeniseian languages are a family of languages that are spoken by the Yeniseian people in the Yenisei River region of central Siberia. As part of the proposed Dené–Yeniseian language family, the Yeniseian languages have been argued to be part of "the first demonstration of a genealogical link between Old World and New World language families that meets the standards of traditional comparative-historical linguistics". The only surviving language of the group today is Ket.

The Yeniseian people refers either to the modern or ancient Siberian populations speaking Yeniseian languages. Despite evidence pointing to the historical presence of Yeniseian populations throughout Central Siberia and Northern Mongolia, only the Ket and Yugh people survive today. The modern Yeniseians live along the eastern middle stretch of the Yenisei River in Northern Siberia. According to the 2021 census, there were 1,088 Kets and 7 Yugs in Russia.