The concept of sustainable development is based on three basic principles: the principles of environmental sustainability, social and cultural sustainability and the principles of economic sustainability. The Republic of Croatia supported the idea of sustainable development, and in 2009 the Croatian Parliament adopted the Strategy for Sustainable Development of the Republic of Croatia, as a key document aimed at environmental protection, economic and social development of the country. The main goal of this paper is to present the historical development of the idea of sustainable development and to present the current level of sustainable development of the Republic of Croatia measured by the SDG index. During the preparation of the graduate thesis, the method of analysis was used for the purpose of studying the theoretical basis of the concept of sustainable development and statistical data on the basic indicators of economic growth and sustainable development. The classification method was used to elaborate the main goal of the Sustainable Development Strategy of the Republic of Croatia, as well as the results of achieving global development goals. The method of description was used to describe the historical development of theories of sustainable development, as well as the results of the Republic of Croatia achieved in the UN program of sustainable development until 2030. The deductive method was used when analyzing the achieved results of the Republic of Croatia when it comes to achieving globally defined goals of sustainable development. Based on the achieved results, the conclusion on sustainable development of the Republic of Croatia was made by the inductive method. The Republic of Croatia has achieved the best results in the field of youth education, where it has made primary education free and accessible, and at the same time invests in adult education. Croatia lowered the at-risk-of-poverty rate, which was 26% in 2017 and 18.3% in 2019, and introduced new poverty monitoring indicators. Croatia lags behind other countries in the field of gender equality, as well as in the field of industry, innovation and infrastructure. Although the Republic of Croatia has excellent broadband coverage, statistical indicators show a low level of Internet use and a high cost of high-speed broadband access. Although the Republic of Croatia ranks high 14th in the world when it comes to achieving the set global goals by 2030, there is still room for international partnership in order to achieve the global goals of sustainable development.