This thesis investigates the relationship between Corporate Social Responsibility (CSR) and Financial Performance (FP) for the top fifty listed companies in the European Union (E.U.). The study aims to determine whether CSR activities have a positive association with FP, using both accounting-based and market-based measures. The research uses data from companies that produce standalone CSR reports, sustainability reports, or include CSR sections in their annual reports. The study employs the Global Reporting Initiative (GRI) Application Level (AL) to measure CSR performance. Two regression models are applied in SPSS to test the hypothesis. The results indicate a positive association between CSR and FP using the accounting-based measure Return on Assets (ROA), but no association is found using the market-based measure Earnings per Share (EPS). The study contributes to the literature by examining the relationship between CSR and FP in the context of EU-listed companies, highlighting the importance of CSR in enhancing financial performance. The research also identifies limitations, including the focus on EU companies and the use of GRI-based CSR measurements. The findings suggest that CSR can positively impact financial performance, but further research is needed to explore the mechanisms and conditions under which this relationship holds. The study provides insights for stakeholders, including executives, managers, and investors, on the potential benefits of CSR in improving financial outcomes.This thesis investigates the relationship between Corporate Social Responsibility (CSR) and Financial Performance (FP) for the top fifty listed companies in the European Union (E.U.). The study aims to determine whether CSR activities have a positive association with FP, using both accounting-based and market-based measures. The research uses data from companies that produce standalone CSR reports, sustainability reports, or include CSR sections in their annual reports. The study employs the Global Reporting Initiative (GRI) Application Level (AL) to measure CSR performance. Two regression models are applied in SPSS to test the hypothesis. The results indicate a positive association between CSR and FP using the accounting-based measure Return on Assets (ROA), but no association is found using the market-based measure Earnings per Share (EPS). The study contributes to the literature by examining the relationship between CSR and FP in the context of EU-listed companies, highlighting the importance of CSR in enhancing financial performance. The research also identifies limitations, including the focus on EU companies and the use of GRI-based CSR measurements. The findings suggest that CSR can positively impact financial performance, but further research is needed to explore the mechanisms and conditions under which this relationship holds. The study provides insights for stakeholders, including executives, managers, and investors, on the potential benefits of CSR in improving financial outcomes.