Numerous national/ethnical groups (Croats, Serbs, Slovenes, Jews, Germans, Italians and Hungarians) have been migrated, either voluntarily or by force, out of Croatian territory and within it. It has caused changes in national/ethnical, religious, demographic and cultural structure of Croatia. This thesis covers a period from the establishment of the Independent State of Croatia till the middle fifties of the 20th century, when Yugoslavia announced the end of the War against Italia, Austria and German and when numerous agreements of the repatriations were signed. The research focused on the migration directions of the population that had to migrate because of racial, national, confessional, political belonging or because of economic reasons. The topics of war prisoners, workers on the forced labor and the repatriations have also been covered.Scientific contribution: The paper gives a systematic and thorough overview of migrations in Croatia in mid 20th century; and is characterised by completeness and a broad grasp of the issue, as well as documentariness in its entirety, from the analysis of concepts to the account of concrete events and relations. The value of the doctor’s dissertation is in the author’s overview of voluntary and forced relocations in Croatia during the World War II and the post-war period, which threw light on the less known part of Croatia’s history in the period between 1941 and mid 1950’s, and the fact that she gave a synthesis of the events which to a large extent marked Croatian society in the 2oth century, based on literature and her own researches.