This essay provides a comparative analysis of business ethics and social responsibility within the four largest Australian banks, focusing on ethical issues such as misleading financial advice, interest rate manipulation, and breaches of anti-money laundering regulations. It examines specific cases, including the Commonwealth Bank's alleged breaches, the National Australia Bank's acceptance of bribes, and Westpac's misleading advice leading to financial losses for clients. The essay further discusses the violation of corporate sustainability frameworks and governance principles by these banks. It highlights the penalties imposed by the Royal Banking Commission and the subsequent business transformations undertaken by the banks. The analysis applies ethical theories like Utilitarianism and Justice theory to evaluate the ethical decision-making processes in these corporate scandals, emphasizing the need for stricter regulations, transparency, and ethical conduct within the Australian banking industry, with the goal of fostering trust and social responsibility among stakeholders.