The environment, as a place where life flows, has undergone crisis and transformation in the contemporary era more than in other periods of history. This process of crisis in the field of the environment has attracted the attention of countries and international institutions to prevent the spread of these crises as much as possible by taking measures at the international, regional and national levels. Undoubtedly, there is no other way to seriously deal with this crisis except for cooperation between governments and international institutions at the global level. The United Nations as an organization that is the manifestation of the presence of governments in the 1960s put attention to the environment on its agenda and prepared the preparations for holding the first international environmental conference in Stockholm in 1972. The United Nations, through its main bodies and subsidiary bodies such as UNEP, the United Nations Commission on Sustainable Development, the Intergovernmental Panel on Climate Change, as well as through its affiliated specialized institutions such as UNESCO, FAO, IMO, and the World Meteorological Organization, has been able to take measures. To be effective in protecting the environment. Also, international organizations have been able to carry out activities in the direction of education on environmental issues, formulation and development of international environmental laws, settlement of environmental disputes, and cooperation and coordination among institutions active in the field of environment. In general, international organizations with their activities in the field of the environment have been able to solve the gaps in international environmental law to a significant extent. Finally, it can be said that the existence of international environmental law in its current form and the optimal preservation of the environment are largely due to the activities of international organizations.