The main objective of this study is to evaluate the effect of the presence of cracks on the electrical resistivity of reinforced concrete specimens. In this study, the effect of both surface-breaking and subsurface/internal cracks on the relative ER of concrete will be evaluated and discussed through COMSOL Simulation. Several crack parameters such as crack width, length, depth and angle will be considered in the analysis. Moreover, analysis of the presence of cracks will be divided into two sets: presence of cracks filled with water and cracks filled with air. In conclusion, both surface-breaking and internal cracks have a significant impact on the electrical resistivity (ER) of concrete, influenced largely by the medium filling the cracks (air or water) and their geometrical characteristics. Additionally, the orientation of the measurement probes relative to surface-breaking cracks is a critical factor, with perpendicular measurements yielding higher ER values compared to parallel measurements.