Controlling is the process of managing and monitoring business activities to achieve organizational goals. In today's environment, characterized by numerous changes and uncertainties, systematic monitoring, data analysis, and strategy adaptation are essential. Controlling helps organizations remain agile, identify the need for adjustments, and make informed decisions to successfully navigate dynamic business environments. One of the main characteristics of financial markets in recent times is constant change and financial innovations that occur almost on a daily basis. In such times, controlling becomes even more critical for financial regulatory and supervisory bodies. When it comes to the regulation and supervision of the financial sector in Croatia, the primary role is held by the Croatian National Bank and the Croatian Financial Services Supervisory Agency. This paper provides a detailed analysis of the state and application of controlling instruments in both institutions to determine the fundamental role of controlling in financial regulatory and supervisory bodies. The main objectives of this paper are to identify the basic tasks of controlling within Croatian financial regulatory and supervisory bodies, analyze the controlling tools utilized therein, and illustrate how controlling adapts to new technologies. In summary, controlling is extremely important for financial regulatory and supervisory bodies in times of financial innovations and digitization because it enables them to adapt and strengthen their supervisory capabilities to effectively respond to dynamic changes in the financial environment. Financial regulatory and supervisory bodies must make informed decisions based on reliable data to support their role in maintaining market stability. In doing so, it is crucial that well-organized controlling ensures efficient resource utilization, aiming to achieve a high standard of services while managing financial resources reasonably. Furthermore, controllers are tasked with recognizing and addressing challenges and seizing opportunities arising from the development of new technologies.