Abstract
At a time of growing globalization, we can observe the increasing role of cooperative strategies among companies, including alliances, joint ventures, and networks. Trust is one of the most important factors of success for any business activity. It relates especially to alliance networks because it can lower transaction costs, increase productivity and innovativeness, facilitate inter-organizational relationships and resolve conflicts. Therefore the article comprehensively discusses the problems of trust in alliance networks. The conclusion of the text is that trust building in alliance networks has an influence on the effectiveness of the whole network. The text is based on the latest world literature as well as the personal experience of the author in creating effective cooperative network agreements.