In the theoretical part of this thesis, macroeconomics is conceptually defined and defined and the subject of macroeconomics is being determined and defined and the subject of the macroecenomic analysis is being explained. Gross domestic product, unemployment, public debt, foreign trade are explained. The second part of the paper analyzes the economies of post-transition EU countries. Gross domestic product is the name given to the total monetary value of final goods and services produced in one economy compared to the previous year. Further emphasizing inflation, it is defined as the process of rising prices in the country. Unemployment is a situation in which the working age population cannot be employed. Foreign trade is the turnover of goods and services between the country and abroad. Public debt is defined as the amount borrowed by the state to finance past budget deficits. The global financial and economic crisis of 2009 led to a major recession in the EU, with recovery in 2010. Croatia, after several years of economic downturn, recorded a significant GDP growth of 2.4%. The highest annual real GDP growth rates in 2017 were recorded in Romania and Slovenia, while the lowest were recorded in Croatia. Among the post-transition countries, Poland and Romania have the highest growth and Croatia the lowest in a period between 2003 and 2008. Furthermore, Estonia had the highest share of wages and Romania the lowest. The lowest unemployment rate in 2018 was in the Czech Republic and the highest in Croatia. The highest levels of public investment were recorded in Hungary and Estonia, with the highest level of business sector investment in the Czech Republic. Croatia needs to make economic growth more stable and sustainable and reduce macroeconomic imbalances.