TREVI was an intergovernmental network, or forum, of national officials from ministries of justice and the interior outside the European Community framework, created during the European Council meeting in Rome, 1–2 December 1975. It ceased to exist when it was integrated into the so-called Justice and Home Affairs (JHA) pillar of the European Union (EU) upon the entry into force of the Treaty of Maastricht in 1992.
The first TREVI meeting at the level of senior officials was held in Rome where the famous Trevi Fountain is located and the meeting was chaired by a Dutchman by the name of Fonteijn (English: Fountain). In some French textbooks, it is noted that TREVI stands for Terrorisme, Radicalisme, Extrémisme et Violence Internationale.
The creation of TREVI was prompted by several terrorist acts, most notably the hostage taking and subsequent massacre during the 1972 Olympic Games in Munich, and the inability of Interpol at that time to effectively assist the European countries in combatting terrorism. While TREVI was initially intended to coordinate effective counterterrorism responses among European governments, it slowly extended its remit to many other issues in crossborder policing between the members of the European Community. Many of the practices and a large part of the structure of the former Third Pillar traced their origins to TREVI.