Yuri Oganessian (Russian: Юрий Цолакович Оганесян [ˈjʉrʲɪj t͡sɐˈlakəvʲɪt͡ɕ ɐgənʲɪˈsʲan]; born 14 April 1933) is a Russian nuclear physicist. He is considered a leader on the subject of superheavy elements. The chemical element oganesson (atomic number 118) is named after him. He is one of only two people who was still alive when a chemical element was named after him. The other was Glenn Seaborg, after whom seaborgium is named.