Esther Silvana Koch-Mehrin (born 17 November 1970, in Wuppertal) is a former German politician of the Free Democratic Party of Germany who served as a Member of the European Parliament from 2004 to 2014.

In October 2012, Koch-Mehrin announced that she would not stand in the 2014 European elections but instead resign from active politics by the end of the parliamentary term.

[4] Like Karl-Theodor zu Guttenberg and Jorgo Chatzimarkakis's doctoral theses, Koch-Mehrin's 2001 thesis, titled 'Historical Currency Unions between Economy and Politics', was analysed by VroniPlag using a crowd-source effort, and she was accused of plagiarism.

[12] During the campaign for the 2009 European Parliament election, Frankfurter Allgemeine Zeitung (FAZ) criticised Koch-Mehrin for attending only 39% of the parliamentary debates, not counting maternity leave.

Since giving a wrong statutory declaration is a criminal act, the European Parliament's administration reviewed additional attendance lists Koch-Mehrin provided.

In 2005, Koch-Mehrin called for all EU Member States to follow Germany in banning public displays of Nazi symbols.