This dissertation shows results of landslide hazard assessment performed in flysch deposits in the area of central Istria. Landslide hazard is defined as probability of landslide occurrence, considered to be a potentially harmful natural process, which can cause damage, loss and bring about other unfavorable effects. Landslide hazard is expressed as probability of landslide occurrence within a specific area and in a specific period of time, with a certain magnitude. The area of investigation is placed in the northeastern part of Istria, in the area of Pazin Paleogene flysch basin which spreads from Trieste Bay in the west, to the Ucka Mountain in the east, while in the north it is bordered with Cicarija Mountain range. Similar siliciclastic sediment rocks of Paleogene age are spread in almost whole Adriatic Croatian coastal zone, as well as in the hinterland. Intensive geomorphologic processes are present in flysch terrains, especially erosion and slope movements. Landslides in flysch slopes in Istria are relatively numerous, and types, mechanisms and conditions of appearance are similar. The performed investigations involved following phases: gathering of historical data from the professional documentation and literature, data preparation and analysis, production of the existing landslide map and landslide causal factor maps, laboratory analyses of physical-mechanical characteristics of soil and rock, spatial analyses of causal factors, selection of the input data and parameters for the deterministic analysis, landslide hazard assessment, model verification and discussion with final conclusions. 3D deterministic simulation of landslide initiation was performed based on the terrain model, cover thickness assumed on the basis of performed investigations, known geotechnical parameters of soil/rock material and influence of the groundwater level rising due to infiltration. Model shows the progressive failure phenomenon, taking into account pore pressure values and expansion of the failure from initial zone in which material strength was exceeded, to the surrounding area, what increases the landslide volume and by that implies to the area in which landslide occurrence is probable at specific groundwater levels. Deterministic landslide hazard analysis was adopted as reliable method of landslide hazard assessment in flysch area, since it allows modeling of heterogeneous conditions in flysch slopes, conditioned with the terrain morphology engineering geological profile, geotechnical parameters of the profile material, pore pressure value etc., and gives objective and precise results that can be shown on the landslide susceptibility and landslide hazard maps used in regional planning and land use. From the results of simulation inside deterministic model developed in LS-Rapid software it can be seen that area with highest spatial probability of sliding is zone next to the geological boundary between limestone and flysch rock in the northeastern part of investigated area, what was confirmed by validation process which consisted of comparing landslide hazard map with landslide inventory. Areas of high hazard, in which no existing landslide was registered, are considered to be potentially highly susceptible in case established conditions for landslide initiation are achieved. To establish the return period, respectively temporal probability of landslide appearance, analysis of the temporal component of landslide hazard was performed next to spatial analysis of sliding factors. Precipitations that anticipated sliding were analyzed and cumulative precipitations which exceed cumulative values that triggered certain landslide in the observed period were determined. Connecting results of the spatial deterministic analysis with calculated return periods of long term, continuous precipitations that triggered some of the analyzed landslides, allows determination of landslide hazard in a specific location of the investigation area. Applied methodology of landslide hazard assessment can be used in areas of similar geological fabric and similar soil and rock material characteristics.