Zeha River is one of a perennial River in the Upper Tekeze Basin, Ethiopia that has not been well developed and utilized for irrigation purpose. This study is initiated to assess Land Potential Suitability for surface water irrigation in the Zeha watershed. Land suitability potential was evaluated by using multi-criteria evaluation such as slope, soil texture, soil depth, soil type, soil drainage, LULC, distance from the water source, distance from the road, and distance from market, rainfall, PH, CEC, ECE, and OC for surface irrigation. The surface water resource potential in the watershed was assessed at 90% dependable minimum available flow and 20% of the available flow was released downstream ecological balance using HBV light model in ArcGIS. The water availability was assessed using the model interface in ArcGIS for simulation of stream flow. The model was calibrated using Monte Carols using data from 2000 to 2012 for calibration and from 2013 to 2018 for validation. Maximum irrigation demand was estimated for maize crop using CROPWAT. Irrigation potential in hectare (ha) was estimated from dependable water supply, released downstream ecological balance water supply and irrigation demand. The irrigation suitability analysis using multicriteria evaluation reveals that 6029.54 ha was highly suitable, 34284.79 ha was moderately suitable and 6512.94 ha was marginally suitable and 12.6 ha was not suitable. The model performance efficiency indicators; coefficients of determination (R 2 ), Nash-Sutcliffe efficiency (NSE), and percent of bias (PBIAS) of 0.71, 0.64, and 1.36% for calibration and 0.7 6, 0.70, and 5.28% for validation respectively in the Zeha stream flow analysis. This shows go od agreement between the simulated and observed discharge values. From the total highly suitable land area identified in the watershed, the identified irrigation potential by use of surface water (Zeha River) was 4068.14 ha for surface irrigation. The total irrigation potential of which can be irrigated by Zeha River was found to be 4068.14 ha which accounts for 8.7% of the total land area of the watershed (46839.83ha). It was investigated that the existing river water potential cannot irrigate the whole identified suitable land in the Zeha watershed. This necessitates harvesting runoff during wet season, store in the structures such as dams, concrete ponds, hand-dug well, and others, and use it a later at dry period for irrigation. Keywords: Multi-Criteria Evaluation; HBV-light model; Surface Irrigation Potential; Suitability, Zeha watershed/river, Lasta District