This master thesis deals with the protected intangible cultural heritage of the Republic of Croatia, which is under the protection of UNESCO. The paper describes the work of UNESCO, Croatia's intangible cultural heritage and points to the importance of preserving and promoting intangible heritage, highlighting its role in safeguarding cultural identity and tradition. Croatia has 19 intangible cultural assets under UNESCO protection and one that requires urgent protection. UNESCO, as an international organization, plays a key role in promoting cooperation among nations through education, science and culture. The organization encourages countries to protect their cultural heritage by nominating cultural heritage for inclusion on the World Heritage List, and providing assistance in its protection and management. The paper offers a detailed descriprion of 20 intangible cultural assets of Croatia under the protection of UNESCO, emphasizing their value and the need for preservation. Challenges of safeguarding the heritage are also mentioned, including a lack of interest among younger generation and the need to raise awareness of the importance of intangible heritage. With this thesis, the intention was to bring the wealth of Croatian intangible heritage closer to the general public and highlight the importance of its preservation for future generations. Finally, the necessity for continuous efforts at the local, national and international level is emphasized in order to ensure the long-term protection and promotion of Croatia's intangible cultural heritage.