The study focuses on teachers' attitudes as a key element in ensuring optimal teaching and learning process. The topicality of the study is justified by the shortcomings in the reforms of the national education system related to the implementation of inclusive education, where one of the most important factors is the insufficient competence of teachers. The purpose is to study the teachers' subjective self-assessment of attitudes towards the implementation of the inclusive education in the context of a three-dimensional model, which includes the affective, behavioural and cognitive indicators of attitude. The research questions are:(1) How do attitudinal components affect teachers' involvement in inclusive education? and (2) What components of attitudes need to be updated in teacher education? A quantitative research methodology, based on correlational research design, is used to address the topic and the survey Attitudes towards Teaching All Students (ATTAS-mm) was employed. For statistical analysis a method of descriptive statistics, Kruskal-Wallis test, and Mann-Whitney test was applied. The study involves teachers with different backgrounds, professional qualifications and involvement in inclusive education. The results confirm that the affective and behavioural dimensions of the attitudes reveal a prevailing positive attitude and the readiness to create an accepting learning environment, whereas the cognitive dimension confirms the negative attitude. Improvement of the content of teacher study programs is necessary to prevent the development of such negative attitudes.