Water resources are essential to the continuation of life. For proper management, planning, and effective use of the resources, understanding of the hydrological environment is very important. The objective of this study is to estimate groundwater recharge of Wabe watershed in Omo Gibe basin of Ethiopia. GIS based Water and Energy Transfer between Soil, Plants, and Atmosphere in Steady State (WetSpass-M) hydrological model was applied to analysis how much recharge occurs, where it occurs, and the spatial-temporal variability of other water balance components like surface runoff and actual evapotranspiration (AET). Long-term hydro meteorological data of precipitation, temperature, wind speed and PE T from 1990 to 2021 and the watershed's physical features like land use land cover, topography, soil type, groundwater level, and slope, were used as inputs to the model. The result indicated that, the annual groundwater recharge ranged from 55.7 to 633.5 mm/yr with a mean groundwater recharge rate of 322.8mm/yr. Around 86 % (275.7 mm) of the recharge occurred during rainy season. The long-term average annual rainfall, 1265.1mm, distributed as surface runoff (28.3%), actual evapotranspiration (46.2%), and ground water recharge (25.5%). Overall, these results provide valuable insights into the hydrological processes governing water balance in the Wabe watershed, crucial for sustainable water resource management in the region. Keywords: Wabe watershed, Recharge, Runoff, AET, WetSpass-M model.