Runoff is a vital component of the hydrological cycle as it controls the amount of water that runs into streams. Worldwide, hydrological models (HMs) like precipitation-runoff and sediment formation are frequently used to simulate hydrological processes. Semi-distributed HMs can imitate water balance spatially for different soils, land use, topography and climatic conditions. Soil and Water Assessment Tool (SWAT) is one amongst these HMs, which has been evaluated in diverse world climates. None of the reviewed studies have carried out hydrological modelling of the Luni River Basin (LRB), Rajasthan, India in recent years. Thus, in the present study, hydrological modelling of the LRB is carried out by using SWAT model. Using historical streamflow and weather data of the LRB, the SWAT model is calibrated and validated corresponding to a monthly temporal scale. The model parameters are calibrated and validated by using data corresponding to time period 1991?2018. The findings of the model calibration and validation revealed coefficients of determination (R2) values to be 0.82 and 0.95, respectively, which indicated ?Very Good? performance of the model. Nash?Sutcliffe (NSE) values are 0.81 and 0.70 corresponding to the calibration and validation, which indicated ?Very Good? performance and ?Good? performance of the model, respectively. The SWAT model is found to be useful in simulating streamflow in the LRB. The developed SWAT model can be used to investigate the effect of land use alteration and climate change on the future streamflow of the LRB.