The Eighth Sister is the unbuilt project for a skyscraper in Zaryadye, Moscow. It would have been the eighth sister to the group of Stalinist skyscrapers known as Seven Sisters. The architect was Dmitry Chechulin.
Original 1947 plans included an eighth tower, which would have been among the tallest buildings in the world. Following Joseph Stalin's death in 1953, it was decided that the projected structure would overshadow the Moscow Kremlin and Chechulin's 1967 Rossiya Hotel was erected on the spot. The hotel was demolished in 2006, and the Zaryadye Park was inaugurated on 9 September 2017.