This study presents the development of a three-dimensional numerical model, the Persian Gulf Oceanic Model (ZSF974), designed to predict oceanographic parameters in the Persian Gulf, along with the results of its validation. The model is based on the primitive equations formulated in a spherical coordinate system with a sigma vertical coordinate. The model equations are solved numerically using the finite difference method: the Lax–Wendroff scheme for advective terms, the DuFort–Frankel scheme for diffusive terms, and the Matsuno scheme to control computational instabilities. The mesh employed is a modified Arakawa C grid. The model accommodates irregular bathymetry and supports variable resolution in both horizontal and vertical directions. Model accuracy was enhanced by optimizing the execution process and by properly applying Nihoul's (1977) theory on the wind-induced surface stress's effect on subsurface layers. After validating the model in idealized laboratory basins against established principles of physical oceanography and previous research, it was applied to the real-world environment of the Persian Gulf. Key results from the model's implementation include a counterclockwise water circulation, the presence of an amphidromic point, the dominance of tidal forces, and the influence of the Arvandrud and Mond rivers. Notably, this riverine impact is significant along the coasts of the United Arab Emirates. The model successfully simulates the general behavior of the oceanic environment in response to various forcing mechanisms. However, long-term simulations indicate that the open boundary conditions require modification and that real tidal forcing should be incorporated. Overall, the model shows significant potential for further development to yield more accurate simulations and robust conclusions.