Between 1999 and 2009 Mojca Kleva was a member Municipal Council of Koper, she also actively participated and led network of non-governmental organizations from the field of women's rights - Women's lobby Slovenia between 2007 and 2009.
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On May 9 2011 she became a Member of the European Parliament replacing Zoran Thaler who resigned from the position due the accusations regarding corruption.
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In May 2011 Mojca Kleva replaced Zoran Thaler as a member of the European Parliament within S&D (Group of the Progressive Alliance of Socialists and Democrats).