This thesis presents analyzes and interpretation of reflection seismic and borehole data from the western part of the Sava Depression in Croatia. Interpretation is targeted to determine morphologic and kinematic features of faults and spatial distribution of neotectonically active faults and associated anticlines and synclines. Spatial distribution of faults, synclines and anticlines is shown by time-structure maps of selected stratigraphic horizons. The oldest horizon is Neogene basement, then the Base Pannonian as the surface on which the oldest Pannonian layers were deposited and in the end the Base Pliocene horizon which is the contact surface between the Upper Miocene layers and either the Pliocene or Quaternary sediments (“Plio-Quaternary”). Spatial distribution and kinematic features of faults in combination with palinspastic reconstruction were used in reconstruction of tectonic evolution of the western part of the Sava Depression, which can be used for a more detail tectonic reconstructions of much wider area, especially for the southwestern part of the Pannonian Basin in Croatia. The main deformation structures are characteristic for both the initial (opening) phase and the inversion (closing) phase of the Sava Depression. Prevailing deformation styles during the inversion phase in study area are the following: partially inverted normal faults; reverse faults which affected sedimentary fill in half-grabens; footwall collapse of early normal fault scarp and pop-up structures.