The article focuses on Irena Wojnar’s collaboration with UNESCO and InSEA. It presents the most important areas of Irena Wojnar’s activity in these organisations (participation in congresses, projects and publications). In addition, the key ideas that Irena Wojnar promoted in these organisations are also presented. The research material I analysed was primarily Irena Wojnar’s publications related to the traditions and ideas propagated by UNESCO and InSEA, as well as congress documentation collected by Irena Wojnar. An important source of information for me was also the lectures given by Professor Irena Wojnar, whom I heard at numerous conferences and seminars organised in Poland and abroad, as well as the direct conversations I had with her (e.g. during the 5th European InSEA Congress in Warsaw). The paper begins with a brief introduction. Then, in two main parts, I discuss Irena Wojnar’s activities and the ideas she promoted within the framework of her cooperation with UNESCO and then within her activities at InSEA. The article concludes with a summary in which I highlight the role that Irena Wojnar played in disseminating the ideals of UNESCO and InSEA in Polish pedagogy and in promoting Polish aesthetic thought, the theory of education through art and humanistic education in the world.