The goal of this study was to simulate the Gonu cyclone and its resulting waves in the Gulf of Oman. The Gonu cyclone wind field was simulated using CGW module of Mike 21 and cyclone track data. Then, using SW module of Mike 21, the simulated wind field and ECMWF parametric boundary condition, the resulting wave field was simulated. The maximum significant wave height of 10.5 m in the Gulf of Oman and 3.8 m in Chabahar was simulated during Gonu cyclone occurrence. This wave height in Chabahar is 12% more than the buoy measurement which is in the safe side for design purposes. Uncertainty in the cyclone radius and insufficiency of the wind measurement points in the study area are major limitations of this research. The wave forecast study of this cyclone is useful in studying the wave climate in the Gulf of Oman and will provide engineers with valuable data for designing coastal structures. This model enables us to estimate the maximum significant wave height during cyclone occurrences. The results were reported to responsible authorities leading to a successful evacuation of the costal regions and saving a significant number of lives.