This study provides a comparative analysis of the economic and humanitarian consequences of war in selected conflict-affected countries, including Sudan, Libya, Syria, Afghanistan, Yemen. Drawing on secondary data from the United Nations, World Bank, International Monetary Fund, and humanitarian organizations, the research reveals that armed conflicts consistently result in catastrophic human loss, mass displacement, and severe economic collapse. The findings show that wars have killed hundreds of thousands of civilians, displaced millions internally and across borders, and destroyed essential infrastructure such as healthcare, education, and energy systems. Economically, the conflicts examined have triggered GDP contractions, hyperinflation, widespread unemployment, and the near-total collapse of foreign direct investment, leaving states dependent on aid or remittances. Beyond national borders, wars exacerbate global food and energy crises, worsening poverty and hunger particularly in developing countries. Within the framework of the United Nations Sustainable Development Goals (SDGs), the study highlights how conflicts obstruct progress toward eradicating poverty, achieving food security, ensuring quality education, and fostering strong institutions. The analysis concludes that war delivers no sustainable economic or political gains while inflicting long-lasting humanitarian and developmental setbacks. It emphasizes the urgent need for diplomatic conflict resolution, institutionalized peacebuilding, and coordinated international accountability to prevent future devastation.