International Relations includes the U.N.
International organization . Notable examples include the United Nations ( UN ) , Organisation for Economic Co-operation and Development ( OECD ) , Organization for Security and Co-operation in Europe ( OSCE ) , Council of Europe ( COE ) , International Labour Organization ( ILO ) , World Trade Organization ( WTO ) & World Health Organization ( WHO ) . International relations . In both cases , the field studies relationships between political entities ( polities ) such as states , sovereign states , empires , inter-governmental organizations ( IGOs ) , international non-governmental organizations ( INs ) , non-governmental organizations ( NGOs ) , and multinational corporations ( MNCs ) , and the wider world-systems produced by this interaction .