ABSTRACT: The aim of this study is to define the fault related geological structures using gravity data around Trabzon. For this purpose, horizontal gradient magnitude, analytic signal, tilt angle, and hyperbolic of tilt angle techniques were operated. By applying these techniques to the first vertical derivative of the regional gravity data, faultsrelated geological structures were identified from maximum amplitude values with horizontal gradient magnitude and analytic signal maps, and zero amplitude values of the tilt angle and hyperbolic of tilt angle maps for this region. The basement topography was calculated using the Parker-Oldenburg algorithm. Identified fault-related geological structures were compared with the existing faults in the region. Although there is a good agreement between this study and the previous studies, some new fault-related structures were also identified. There is a significant relationship among the distribution of the fault-related geological structures, mineral deposits, and also earthquake epicenters in the region. This study was resulted to shed some light on the other following small to large scale geological studies for better understanding of the geological structure of the region. It is also believed that the results of the study maybe a guide to the search for new mineral deposits and the identification of risky locations for earthquakes.