The importance of cultures and cultural diversity remains undisputed, even in an increasingly interconnected and globalised world. The concept of cultural intelligence is becoming increasingly important in this context. Cultural intelligence is not only a key to promoting understanding and tolerance between people of different origins, but also a key to contemporary leadership behaviour and success in a globalised business world.1 The need for cultural intelligence extends to various areas of life, including work, education, health and interpersonal relationships. At a time when multicultural teams, international business relationships and migration are on the rise, the ability to understand and deal constructively with cultural differences is crucial.2 Against this background, the importance of cultural intelligence is examined. The aim is to discuss the reasons why cultural intelligence is so relevant in the modern world and especially in the context of leadership. It also examines success factors and strategies that enable managers and professionals to develop cultural intelligence and use it successfully both professionally and personally. The dimensions of cultural intelligence will be explored in more depth and the benefits associated with a culturally sensitive approach to leadership and collaboration will be emphasised.