An apartment lease agreement in Croatia is a legal instrument that regulates the relationship between the lessor and the lessee. The subject of this thesis is an overview of the legal norms and practical implications that the apartment lease agreement has on the protection of the interests of both parties as well as the importance of this agreement in the context of the stability of residential relations in Croatia. In the first part of the thesis, the introductory issues of the apartment lease agreement are explained, and the aim, structure, and scientific methods of the thesis are described. The central part of the thesis describes the definition, determination and duration of the apartment lease. The final part of the thesis presents the elements of the apartment lease agreement - the content of the agreement, the amount and conditions of the rent, the reasons and ways of canceling the agreement, and the features of the apartment lease agreement in selected legal systems of the continental European legal framework, using Germany and Austria as examples. Various scientific methods were applied in the thesis: method of description, method of analysis and synthesis, method of generalization, method of induction and deduction, and method of analysis and synthesis.