<p>This review comprehensively examines the role of metal oxide nanoparticles in enhancing the properties of nanocomposite polymer gels for water shutoff applications in the oil and gas industry. The study highlights the critical importance of optimizing gel formulations to address challenges such as water production, which significantly impacts oil recovery efficiency and operational costs. The review is structured to first discuss the fundamental components of polymer gels, including polymers, crosslinkers, and additives, and their roles in gel synthesis. It then delves into the evaluation methods for key gel properties, such as gelation time, gel strength, viscosity, thermal stability, and syneresis resistance. A significant focus is placed on the impact of metal oxide nanoparticles, such as SiO₂, Al₂O₃, Fe₂O₃, and Cr₂O₃, on these properties. The review demonstrates that nanoparticles enhance gel strength, thermal stability, and resistance to syneresis without significantly altering gelation time, making them ideal for harsh subsurface conditions. Furthermore, the review explores the morphological and textural characteristics of gels using SEM imaging, emphasizing the importance of nanoparticle dispersion and concentration. The findings underscore the potential of nanocomposite gels to improve water shutoff efficiency, reduce permeability, and enhance oil recovery. By integrating recent research and experimental data, this review provides a detailed roadmap for optimizing nanocomposite gel formulations, offering valuable insights for researchers and industry professionals aiming to develop advanced materials for water shutoff applications.</p>