Ernst Ulrich von Weizsäcker (born 25 June 1939) is a German scientist and politician (SPD).

He was a member of the German Bundestag and served as co-president of the Club of Rome jointly with Anders Wijkman from 2011 – 2019.

In 1991, Weizsäcker became founding president of the Wuppertal Institute, soon establishing itself as a leading environmental think tank.

In 1998, he was elected a member of the German Bundestag for the Social Democratic Party (SPD) and was re-elected in 2002.

After his decision not to run in the 2005 election, he became Dean of the Bren School of Environmental Science & Management at the University of California, Santa Barbara.