Abstract: This study investigates the relationship between capital structure and firm value across various industries. Using a cross-sectional quantitative analysis, the research examines how different levels of debt, equity, and financial leverage affect firm value, measured by market capitalization and Tobin's Q. The findings suggest that firms with moderate debt levels experience enhanced firm value, benefiting from the tax shields provided by debt without incurring significant financial distress. However, excessive financial leverage negatively impacts firm value, as firms face increased risk of financial instability. The study supports key theories such as the trade-off theory and pecking order theory, demonstrating that capital structure decisions are influenced by factors such as firm size, profitability, and industry characteristics. The implications for corporate managers and investors include optimizing debt-equity balance to maximize firm value while managing financial risk. Future research should focus on industry-specific dynamics and longitudinal analyses to further explore these relationships.