How many organizations participated in the Shanghai World Expo?

56 participating international organizations:

African Union Commission, Association of Southeast Asian Nations, Boao Forum for Asia, Caribbean Community, Caribbean Development Bank, Common Market for Eastern and Southern Africa, European Organization for the Exploitation of Meteorological Satellites, Food and Agriculture Organization of the United Nations, Business Forum of French-speaking Countries, Global Environment Facility, Group on Earth Observation, International Telecommunication Union, International Museum Association, International Information Development Network, International Federation of Red Cross and Red Crescent Societies and International Fund for Agricultural Development. International Maritime Organization, International Bamboo and Rattan Organization, International Organization for Migration, International Telecommunication Union, UNAIDS, League of Arab States, United Nations Human Rights Council, Pacific Islands Forum, Shanghai Cooperation Organization, South Pacific Tourism Organization, Special Unit for South-South Cooperation of United Nations Development Programme, UN-Habitat, United Cities and Local Governments, United Nations, United Nations Children's Fund, United Nations Conference on Trade and Development, United Nations Convention to Combat Desertification, United Nations Development Programme, United Nations Asia-Pacific Economic Cooperation, United Nations Economic Commission for Europe, UNESCO, United Nations Environment Programme, United Nations Global Compact, UNHCR, United Nations Industrial Development Organization, United Nations Institute for Training and Research, United Nations International Agency for Disaster Reduction, United Nations Mine Action Team, United Nations Population Fund, World Bank, World Food Programme, World Health Organization, World Intellectual Property Organization, World Meteorological Organization, World Tourism Organization and World Trade Center Association.