On 14 November 2017, Katsouranis was appointed as Ambassador of the United Nations. The announcement stated: "The European Champion and Technical Director of Panachaiki F.C. Kostas Katsouranis was delighted to participate in the information campaign on the 17 UN Sustainable Development Goals. Sport and Athletes around the world play a very important role in achieving the Goals, Development, Peace and Human Rights. We like to thank Kostas Katsouranis for his participation and his substantial contribution to the success of their efforts." On 28 November 2018, he resigned from the position.