The main issue of this final work was to research the role of commercial banks on the financial market of the Republic of Croatia. For the economic stability of the Republic of Croatia it is of great importance that the financial system is stable and functioning well. Because of the combination of supply and demand, financial markets are set as an integral part of the financial system. Business banks are the most important institutions in the financial market because they are the only ones authorized to receive deposits and other forms of return from the public. They are also the most active financial institutions in all three financial markets; money, foreign exchange and capital markets. In 2017, commercial banks in Croatia experienced a slight increase in assets, halting the long-term decline trend. Most of the funds of a commercial bank invest in loans whose quality has improved and where the kuna component has risen. This is in fact the result of the fall in interest rates on the market, but also of the greater population awareness of the risk of borrowing foreign currency loans. In the financial market, commercial banks are mostly the role of funders and investors. They market transactions on their own, collect funds and invest them, but also mediate for those who do not have access to markets.