Tématem práce je komparace rozšíření Evropské unie o dvě země, jmenovitě Chorvatsko a Srbsko. Ačkoli měly obě země podobnou výchozí situaci, dnes se nacházejí na odlišném stupni integrace do Evropské unie. Cílem práce je porovnat přechod k demokracii a proces evropeizace a jejich úspěšnost v obou zemích. Práce se zaměřuje na tři hlavní oblasti. První je vytvoření teoretického rámce pro uchopení tématu. Zde se zabývá teorií tranzice, na kterou bude logicky navazovat druhá část práce. Potom je tady popsána také teorie rozšiřování Evropské unie a definována evropeizace, což bude opět využito ve třetí části práce. Jak je zmíněno výše, druhý úsek práce je zaměřen na demokratickou tranzici Chorvatska a Srbska od roku 2000, potažmo už od rozpadu Jugoslávie na počátku 90. let minulého století. A v třetím oddílu je zkoumán proces evropeizace a začleňování zemí do evropských struktur. Jsou zde popsány limity a překážky, které země musely překonat, nebo se s nimi popřípadě ještě zabývají a snaží se je reformovat.This thesis is a comparative study of the EU enlargement, where compared objects are two states of Western Balkans, namely Croatia and Serbia. Although both states were in simile starting situation, they are currently on a differentlevel of enlargement process. The aim of tis thesis is to compare the transition to democracy and the process of Europeanization and their success in both countries. The thesis focuses on three main areas. The first is to create a theoretical framework for grasping the subject. It deals with the theory of transition, which is logically followed by the second part. Then there is also the theory described enlargement of the European Union and defined Europeanization, which is used again in the third part. As mentioned above, the second part focuses on democratic transition in Croatia and Serbia since 2000, hence since the breakup of Yugoslavia in the early 90s. The third section focuses on the process of Europeanization and integration of both countries into the European structures. There are described limits and barriers that countries had to or still have to overcome. Key words: This thesis is a comparative study of the EU enlargement, where compared objects are two states of Western Balkans, namely Croatia and Serbia. Although both states were in simile starting situation, they are currently on a differentlevel of enlargement process. The aim of tis thesis is to compare the transition to democracy and the process of Europeanization and their success in both countries. The thesis focuses on three main areas. The first is to create a theoretical framework for grasping the subject. It deals with the theory of transition, which is logically followed by the second part. Then there is also the theory described enlargement of the European Union and defined Europeanization, which is used again in the third part. As mentioned above, the second part focuses on democratic transition in Croatia and Serbia since 2000, hence since the breakup of Yugoslavia in the early 90s. The third section focuses on the process of Europeanization and integration of both countries into the European structures. There are described limits and barriers that countries had to or still have to overcome.