The strategic cooperation of the tourist boards of Western Istria represents the concept of cooperation of tourism partners with the common goal of achieving the greatest possible success on the market.. Individual TZs of Istria cannot always cope with an increasingly complex environment characterized by global competition, information technology and the increased sophistication of tourists. For them there is a need to obtain materials, skills, innovation, finance or access to markets where they can become more efficient through cooperation. The pressure to survive in an increasingly competitive, dynamic and complex tourist environment with limited resources led TZ Istria to research different forms of cooperation and other hybrid arrangements such as alternatives to more traditional internal development, diversification and merger. Such cooperation is realized on a daily level in the context of the exchange of information, documentation, statistical indicators and promotion on websites, while long-term cooperation is realized through synergistic effects, which are evident in the form of joint cooperation in the organization of manifestations, fairs, events or the joint implementation of certain projects financed from national sources and EU funds. The cooperation between the TZ of Western Istria is very constructive, and by joining the destinations of Western Istria into tourist clusters, the cooperation between their TZs in the matter of joint management of events, attractions and cultural-historical heritage has been strengthened. This kind of cooperation should maintain continuity in future development perspectives as it will contribute to the further development of the competitiveness not only of tourism in Istria, but also the tourism of each individual destination in western Istria.