This paper deals with the subject of representation and introduction of the companies. In the law, generally, every legal transaction is regulated to the smallest details. Croatian legislation took over the German laws on companies. Consequently to the German principle, the area of advocacy and representation of the companies is regulated. The aim is to specify the detailed representation of the companies in the Croatian legislation, which is shown through four units. Unit two talks about business companies in Croatia. The present laws and other legal acts in the area of company law are shown, with particular reference to the Companies Act. A bit more has been told about the types of companies and the manner of establishing and launching the business activities of companies. Unit three discusses the representations of companies. Displayed are representation by the law, and representation by proxy. Unit four talks about representation of the leasing company. Firstly, it has been told about the concept of leasing of companies, business and the types of leasing companies and the authorities of the leasing companies, with particular reference to management, which is responsible for representing the company.