Karl-Theodor zu Guttenberg, German businessman and politician, German Federal Minister of Defence
Karl-Theodor Maria Nikolaus Johann Jacob Philipp Franz Joseph Sylvester Buhl-Freiherr von und zu Guttenberg (born 5 December 1971), known professionally as Karl-Theodor zu Guttenberg, is a German businessman and politician of the Christian Social Union (CSU). He served as a member of the Bundestag from 2002 to 2011, as Secretary-General of the CSU from 2008 to 2009, as Federal Minister for Economics and Technology in 2009 and as Federal Minister of Defence from 2009 to 2011.

After the discovery of plagiarism in his doctoral dissertation and the decision of the University of Bayreuth to revoke his doctorate, an affair known as Guttenberg plagiarism scandal, he resigned from all political posts in March 2011.

In 2011, Guttenberg joined the Center for Strategic and International Studies (CSIS). Guttenberg is the chairman and a founder of Spitzberg Partners, an advisory and investment firm based in New York City. He returned to German politics during the 2017 federal election by making a speech which was widely described as a comeback.