Banks are the most important institutions in the context of credit institutions. Almost all credits relating to events in the financial market are, mainly, based on banks, since banks are the holders of the majority of events thereof. In the context of financing credit institutions, it is possible to speak about two basic groups, namely deposit and non-deposit sources of funding. There are a series of factors influencing their amount, long-term and short term influences that are reflected in the national and international financial market. On the other side, their analysis gives a series of possibilities in terms of success of the banking sector on a country, financial potential of the banks and other. The leading source, namely the instrument of financing credit institutions in Croatia are deposits, whose structure has been influenced by many factors in the last few years. Changes are evident also in the context of other sources of financing, but those oscillations and changes have not diminished the real financial potential of those institutions. In the last ten years sources of financing banks have experienced to important changes, both in values and in shares of total financial resources, and that has been highly influenced by the changes in the international financial market, as well as the emergence of the world economic crisis. In the last years, after the stabilization of the crisis period, sources of financial resources of credit institutions in Croatia are more consistent, their expenses lower.