<p>In this research, an experimental study was conducted for the first time in Korea to investigate the aerodynamic characteristics of a generic missile configuration equipped with grid fins under transonic flow conditions. Understanding the aerodynamic behavior of grid fins in this regime is critical due to their significant impact on missile stability and control during high-speed flights. Wind tunnel tests were carried out over a Mach number range of 0.6–1.2. The test models consisted of a cylindrical body fitted with three distinct types of grid fins to evaluate the influence of fin geometry on aerodynamic performance. Aerodynamic forces and moments were measured using a six-component internal balance, while Schlieren photography was employed to visualize flow phenomena, such as shock waves and flow separations. This dual approach provided comprehensive insights into the interaction between shock waves and grid fin geometry, revealing the critical role of blockage ratios in determining aerodynamic stability and control. These findings contribute to the broader understanding of grid fin performance and offer a foundation for optimizing their design in high-performance missile systems.</p>