This paper focuses on the optimization of Friction Stir Welding (FSW) parameters to enhance weld quality in DP500 and DP780 Dual Phase (DP) Steels, commonly utilized in automotive applications. As DP steels are renowned for their high-tensile strength and ability to absorb energy during impacts, they are ideal materials for automotive parts requiring exceptional strength and durability. DP500 and DP780 are specifically chosen due to their widespread applications in critical automotive components such as body side inners, quarter panel inners and rear rails. Through simulation studies conducted using ANSYS software, thin sheets of DP500 and DP780 with dimensions of 75mm length, 32mm width and 3.2mm thick are welded together using a tungsten carbide FSW tool. Parameters such as Tool Rotational Speed (800/1000/1200 RPM), Welding Speed (40/60/80 mm/min) and Shoulder Diameter (12/14/16 mm) were systematically varied to optimize the weld quality. Tensile strength, a key indicator of weld quality, is used as the primary metric for evaluation. Minitab software and Taguchi method analysis are employed for data analysis and determination of the optimal welding parameters. ANOVA is carried out to identify the significant parameter that affects the weld quality.  The results revealed that the highest tensile strength, indicative of optimal weld quality, was achieved at a tool rotational speed of 1200 RPM, welding speed of 80 mm/min, and shoulder diameter of 14 mm. This study provides valuable insights into the FSW process parameters for achieving high-quality welds in DP500 and DP780 DP Steels, crucial for enhancing the performance and durability of automotive components.