The objective of this study is to determine the effect of patch size and optimal patch dimension for a glass fiber-reinforced polymer composite plate with a central hole under a four-point bending load. The plate consists of a symmetric 16-layer structure with dimensions of 125 mm × 15 mm × 2.5 mm and a 5 mm diameter hole in the center. Patch repairs are employed to enhance the bending strength of the specimen by varying patch length and thickness. However, the primary challenge involves determining the ideal patch dimensions and placement that result in improved performance without compromising structural integrity. In order to address this issue, different patch sizes are simulated using Abaqus to assess their effect on stress distribution, stiffness, and strength of the plate. The Abaqus-based simulation helps in finding the most efficient patch design in terms of dimensions, ultimately contributing to the development of repair strategies for composite materials in practical applications. The results of this study will inform guidelines for patch repair in composite structures subjected to flexural loads, ensuring an optimized balance between structural reinforcement and material efficiency.