Mrs. Vardinoyannis co-operates with several NGOs around the world, such as: Fondation pour l`Enfance (France), AVEC (France), International Peace Bureau (Switzerland), Hague Appeal for Peace, Jordan River Foundation (Jordan), Robert F. Kennedy Human Rights (USA), Heydar Aliyev Foundation (Azerbaijan), Qatar Foundation (Qatar) and others. She participated in many international and European meetings, such as:

    1. The first ECPAT World Congress on Sexual Exploitation of Children, in Stockholm, which was held under the auspices of H.M. Queen Silvia of Sweden (August, 1996)
    2. The Summit of the “Fondation pour l’Enfance” in Paris, for the presentation of the work of the “European Office for Missing and Exploited Children”. She participated as a keynote speaker (November 1997)
    3. The International Conference on Missing Children organised by INTERPOL and the “Fondation pour l’Enfance”, in Lyon-France (March 1999)
    4. The International Conference “Global Solidarity: the way to Peace and International Cooperation” organised by the Department of Public Information of the United Nations, in New York (August, 2000)
    5. The “International Conference for a Culture of Peace” organised by the Foundation for a Culture of Peace, in Madrid, where she addressed the Opening Ceremony of the Conference (December 2000)
    6. The Second International Conference of FAM Network (Women-Mediterranean Creators) for the Culture of Peace, held in Rhodes (September 2002)
    7. As founding member, she attended the meetings of the Global Humanitarian Forum under the leadership of Mr. Kofi Annan held in Geneva. The Forum was aiming at raising awareness of the global community regarding the humanitarian impacts of climate change. (2007-2010)
    8. The Vienna Trafficking Forum organized by the UN.GIFT and the UNODC. (February, 2008)
    9. The conference for the elimination of poverty in Baku, Azerbaijan, organised by the “YES” International Campaign in cooperation with the Azerbaijani 
      Ministry of Youth and Sports, under the auspices of the First Lady of Azerbaijan Mrs. Mehriban Aliyeva (September, 2008)
    10. The International High Level Strategic Meeting on Education organised in Doha, Qatar, on the framework of the “Educate a Child Initiative”, under the auspices of H.H. Sheikha Moza bint Nasser (April, 2013)
    11. The World Innovation Summit on Education entitled “Reinventing Education for Life”, held in Doha, Qatar, organised by the Qatar Foundation under the auspices of H.H. Sheikha Moza bint Nasser (October 2013 and October 2014)
    12. The International Night for the Child organized annually by the “Fondation pour l’Enfance”.
    13. The Anniversary of the “Charter of Paris against Cancer” organized by AVEC annually.
    14. The “Ripple of Hope Human Rights Awards 2014” held in New York, USA and organised by the “Robert F. Kennedy Human Rights Center” (December 2014).