The thesis studies the immigration of population from the Mediterranean countries into the territory of the former Dubrovnik Republic in the period between the fall of the Dubrovnik Republic and the end of the World War I. Research was primarily based on parish registers from the Dubrovnik area. They provided an insight into various segments of life of ordinary people and thus played a critical role in studying the history of population. The 1815 register of aliens in Dubrovnik, the 1817 census, the probate records and a number of other documents mostly from the State Archives in Dubrovnik were used along with the parish register. Research defines migration flows from the Mediterranean countries to the Dubrovnik area. Most of the migrants came from Italy, while the intensity of immigration from other Mediterranean countries was weak. Apart from Italy, migrants came from France, Spain, Albania and Greece. A high concentration of migrants from Italy allowed the implementation of quantitative analysis, while qualitative research method was used to examine other groups of immigrants. It was mostly individual, predominantly urban, economically motivated migration that reached its peak in the early and late 19th century. Observation of the defining moments in life of immigrants helped gain insight into their personal information, their family structure, the rhythm of birth and marriage, and their customs and social networks. Quantitative research method with its numerical expression contributed to the detection of certain phenomena. Microdemographic approach was used to observe individuals and their descendants from birth to death. The genealogical method helped identify the links of kinship. Insight into age, country of origin, occupation and social status of immigrants was gained, and the results were put into the social and economic context of the time. This study explored the attitude of immigrants towards marriage, family, offspring, age to start a family, and towards illegitimate children. A successful inclusion in economic activities, the birth of a child or marriage with a local were primary reasons for staying and permanently residing in Dubrovnik. Family as a key research element was the basis for assembling the immigration and the integration process mosaic. The analysis of the spatial distribution of housing for immigrants, of the participation of immigrants in social institutions and the analysis of their social networks helped understand the integration of immigrants. The Dubrovnik society of the 19th and the early 20th centuries enabled a vertical social mobility of immigrants. Some texts in the newspapers of that period touched on everyday life and included Italian immigrants. This study incorporates newspaper articles depicting diverse social and everyday events. Thus, we get a better grasp of how immigrants were accepted and perceived by the local community in a new environment. The relationship varied between the positive and the negative pole and was determined by the historical context, i.e. by the current political and economic circumstances. Several associations were established where immigrants gathered, socialized and hence expressed their cultural affiliation. Efforts made towards setting up a private Italian school were shown in the study. The significance and the work of the consular post of the Kingdom of Italy in Dubrovnik were also reflected upon. The life of several prominent immigrants and their descendants was presented, as well as of those whose life was affected by specific issues or difficulties that arose during their integration into the new environment.