This essay provides a comparative analysis of the ethical philosophies of Immanuel Kant and John Stuart Mill. The essay begins by outlining Kant's deontological ethics, including the concept of the categorical imperative and its role in moral decision-making, along with a discussion of how Kant's theory might respond to criticisms. The essay then explores Mill's utilitarianism, emphasizing the principle of maximizing happiness and addressing potential critiques of this approach. Furthermore, the essay discusses Nietzsche's concepts of master and slave morality. The analysis includes a discussion of the strengths and weaknesses of each philosopher's perspective, providing a comprehensive understanding of their contrasting views on ethics. The essay concludes by considering how these philosophies might apply to contemporary ethical issues, offering insights into the complexities of moral reasoning. The essay is supported by references to key works and scholarly articles to validate the arguments.