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Roentgenium (pronounced /rɛntˈgɛniəm/, /rʌntˈdʒɛniəm/) is a chemical element. It is a transition metal. Its symbol is Rg, and its position in the periodic table of the elements is 111. It is named in honor of Wilhelm Conrad Röntgen, a German physicist.

So far, it has not been found in nature. There seem to be 7 isotopes. All of them are radioactive. They have a half life of between 1.6 milliseconds and 26 seconds. Because of the Inert pair effect, it could have a color similar to that of gold.