This case study examines the legal framework surrounding the operations of Commonwealth Bank of Australia (CBA), a multinational bank operating in various countries. It analyzes the key Australian legislation governing banking, corporate governance, and consumer protection, including the Reserve Bank Act 1959, the Banking Act 1959, the Corporations Act 2001, the Australian Securities and Investments Commission Act 2001, and the Competition and Consumer Act 2010. The study also explores the impact of international agreements, such as the China-Australia Free Trade Agreement (ChAFTA), on CBA's operations and the role of fintech innovation in shaping the bank's future. By analyzing the legal and regulatory landscape, this case study provides insights into the challenges and opportunities faced by multinational banks operating in a globalized environment.