The primary subject of this thesis is the theoretical analysis of the topic entitled „European Collective Agreement as a Source of Rights". At present, European labor law has greatly influenced the overall harmonization and strengthening of the European Union, namely the rights of workers and the protection of mobility. It can therefore be said that European labor law is the right of the European Union to regulate individual and collective labor relations between employers and workers. In relation to previously defined relationships, labor law at European Union level covers working conditions and the notification and consultation of workers on collective dismissals of surplus workers as well as the ways of transferring companies. On the other hand, the European Union seeks to promote overall social progress, ie to improve the living and working conditions of an individual, ultimately influencing fundamental policies related to achieving a high level of employment, improving living conditions and protecting social cohesion. Furthermore, special sources of European labor rights can be considered as collective agreements, and the need for their creation is due to differences in economic development and living standards in individual Member States. The European collective agreement is concluded by employers, or employers' organizations, and organizations representing workers at the European level, including European cross-border, branch and regional collective agreements. Like every contract, the European collective agreement also has its own construction and content and consists of normative and mandatory provisions. Ultimately, it can be said that certain research methods will be used when defining the primary subject of the research, and include analysis, synthesis, induction, deduction, abstraction and concretization. All collected knowledge, definitions and conceptual determinations, ie all collected research results obtained using the aforementioned methods, will be used for the purpose of studying the subject being studied.