Structural framework of the Plitvice Lakes National park (PLNP) is the result of orogenesis during the Eocene and Oligocene, which was affected by neotectonics activities during Neogene and Quaternary. The principal research objectives of this MSc Thesis is to investigate geological properties of the PLNP area through field structural and stratigraphic investigations in which the data on the orientation of strata, faults, fractures and axial planes of folded structures were collected. Also, deposits in the Plitvice Lakes National Park were sampled to determine their stratigraphic age and composition. Study area includes Mesozoic deposits from Lower Triassic to Upper Cretaceous, mostly composed of limestones and dolomites. Collected structural data were organized into the GIS database and are illustrated in stereographic projection using Stereonet 10 software while structural analysis of palaeostress field was made using the Tectonics FP software. Calculation of palaeostress field included the calculation of the principal stress axes for the fault groups. Structural analysis defined three tectonic phases that formed the structures. These tectonic phases include the Dinaridic phase, which generated reverse fault system by compression oriented NE–SW, followed by formation of normal faults, generated by extension of the same orientation at the end of the Dinaridic phase (i.e., post-Dinaridic phase). During the final phase strike-slip faults were formed, and they show evidences of stress field changes from dominant compression regime to the transpressive/transtensive stress regime. Along with the structural analysis of structural measurements, structural framework of the Plitvice Lakes National Park was analysed on five geological profiles constructed normal to the structures, and these profiles were used to create simplified structural model using the “Move” software (Midland Valley). Structural and stratigraphic analyses and constructed graphical model enabled better understanding of the geological structure of the Plitvice Lakes National Park area, as well as better understanding of the tectonic evolution of the area, mapped faults and fractures, which together with erosion and hydrogeological activity influenced the formation and sustainability of the lake system during the Quaternary.