World War I, which lasted from 1914 to 1918, left a deep impact on Europe, both socially, politically and economically. With more than 16 million people killed and millions injured, the conflict is creating an extraordinary humanitarian crisis. The war participants experienced not only loss of life, but also widespread damage to infrastructure. One of the significant consequences of World War I was the change in the political map of Europe. After the war ended, many great empires such as the Austro-Hungarian and Ottoman collapsed, resulting in the formation of new states. Countries such as Czechoslovakia and Yugoslavia emerged, overhauling national maps that had existed for centuries. This created long-standing ethnic tensions and conflicts that continue to destabilize the region. The European economy was also drastically affected. The extremely high costs of war left many countries in huge debts, which were difficult to repay in the future. The collapse of industry in countries heavily involved in war led to high levels of unemployment and social chaos. France and Germany, in particular, suffered major losses in infrastructure and production capacity, which slowed their economic recovery. The social impact of World War I cannot be ignored either. This war sparked a change in gender roles, with women taking over many of the jobs previously done by men who had gone to war. These changes strengthened the movement for voting rights for women in various European countries. In 1918, England was one of the few countries to grant women the right to vote, a monumental step in the fight for gender equality. Psychologically, European society shows signs of deep trauma due to war. The terms “war sickness” or “war neurosis” emerged, describing the mental condition that many veterans experienced after returning. Combat skills and experiences have a negative impact on many individuals, sometimes leading to mental health problems throughout their lives. World War I also caused changes in art and culture. Many artists and writers expressed their experiences through works that reflected the uncertainty and emptiness caused by the war. Literary trends such as modernism grew rapidly, as artists sought new ways to reflect changing realities. From a geopolitical perspective, the Treaty of Versailles signed in 1919 also had far-reaching impacts. This treaty not only imposed heavy sanctions on Germany but also created the conditions that led to World War II. Many historians argue that perceived absolute victory on the part of the Allies created a sense of resentment in Germany that led to the rise of fascism. As Europe attempted to recover from the wounds of war, new ideas of international collaboration emerged, culminating in the creation of the League of Nations. Although these efforts aimed to prevent future conflict, the League’s structural weaknesses contributed to continued instability in Europe. Overall, the impact of World War I on Europe was not limited to death and loss. Major changes in the political, economic, social, and cultural landscape became a legacy that shaped Europe over the following decades, making this conflict one of the most significant turning points in modern history.