This paper will discuss Controlling non-profit organizations on the example of the Croatian Red Cross. Controlling can be defined as a management function that helps in seeking planned results from subordinates, managers and at all levels of the organization. The control function helps to measure progress towards organizational goals and brings deviations and indicates corrective measures. The importance of non-profit organizations will be defined on the basis of various literature and data collected by the research, and show the importance of non-profit organizations, and we will present the obtained data on a practical example. Controlling is a management function that helps to check for errors in order to take corrective actions. This is done to minimize deviations from the standard and ensure that the stated goals of the organization are achieved in the desired way. Controlling consists of checking that everything is happening in accordance with the adopted plans, issued instructions and established principles. Controlling ensures efficient and effective use of organizational resources to achieve planned goals. Controlling measures the deviation of actual performance from standard performance, detects the causes of such deviations, and helps to take corrective action. Controlling can also be defined as that function of the system that adjusts actions as needed to achieve a plan or to maintain deviations from system objectives within acceptable limits. The management subsystem works in close harmony with the operating system. The degree of their interaction depends on the nature of the operating system and its goals. Controlling generally means comparing results with standards or benchmarks or some regulation. We understand that controllers are evolving in an escort Controlling can also be defined as that function of the system that adjusts actions as needed to achieve a plan or to maintain deviations from system objectives within acceptable limits.