This Croatian biobank is family-based, cross-sectional genetics studies of population cohorts from the Island of Korcula (3000 individuals) and the mainland city of Split (1000 individuals). Blood samples were collected along with many clinical and biochemical measures and lifestyle and health questionnaires. The CROATIA-Korcula and CROATIA-Split studies were funded by grants from the Medical Research Council (UK), from the Republic of Croatia Ministry of Science, Education and Sports (108-1080315-0302; 216-1080315-0302) and the Croatian Science Foundation (8875); and the CROATIA-Korčula genotyping was funded by the European Union framework program 6 project EUROSPAN (LSHGCT2006018947). This data dictionary outlines what phenotypes were measured and what questions volunteers were asked and indicates the data that is available. Croatian biobank website:https://mefst.unist.hr/research/research-groups-and-laboratories/10-001-dalmatian-croatian-biobank/5038See Croatia_Cohorts_Data_Dictionary_ReadMe.txt