This book provides an in-depth exploration of divine command theory, a theological and philosophical framework that asserts that moral truths are grounded in the will and nature of God. By rooting morality in divine commands, this ethical theory offers a stable and objective foundation for human behavior, standing in contrast to moral relativism and secular ethical systems. Throughout the book, the core principles of divine command theory are examined, including the nature of goodness, the relationship between God's will and human moral obligations, and the role of reason, conscience, and divine grace in ethical decision-making. The book delves into the historical development of divine command theory, with insights from thinkers such as Augustine, Thomas Aquinas, and Robert Merrihew Adams, while addressing key philosophical challenges, including the Euthyphro dilemma and concerns about the arbitrariness of morality. Furthermore, it explores how divine command theory interacts with modern ethical dilemmas in bioethics, environmental ethics, and technology, offering practical applications of the theory in areas such as reproductive ethics, genetic engineering, and artificial intelligence. A critical examination of divine command theory's defense of human rights is also included, emphasizing the universal applicability of moral obligations that stem from the inherent dignity of the human person, as created in the image of God. This universal foundation serves as a basis for addressing global ethical issues, such as social justice, poverty, human trafficking, and environmental stewardship. Through this comprehensive study, the book presents divine command theory as an enduring and relevant moral system that provides clarity and guidance in an ethically complex world. By aligning human actions with God's unchanging moral law, individuals can navigate moral challenges while growing in their relationship with the divine.