Humanitarian intervention is a many layered and complex concept. While moral society has an obligation to stop deliberate and persistent serious human rights abuse, the direct use of force remains a contentious option alongside other strategies employed by the international community. This study analyzes the various ethical positions, particularly consequentialism, welfare-utilitarianism and just war theory to unravel this intricate topic. Uniquely, the book goes beyond previous philosophical or ethical treatments of the subject to provide a more rounded and practical reflection on the lessons learned from the revival of humanitarian intervention as a tool of conflict resolution.