This research explores the connection between The Great Wars and Cinema, examining how these major conflicts influenced and were influenced by the film industry. Beginning with an introduction to the causes and triggers of the wars, it traces the evolution of cinema from the pre-war era through the changes brought by the wars. The study focuses on the interdependent relationship between War and Cinema, highlighting how major participating countries used films for propaganda, morale-boosting, and ideological dissemination. As cinema became a dominant art form in the entertainment industry, it had significant socio-economic impacts, influencing national economies and public sentiment. The study also delves into the birth of "German Expressionism," a film technique that emerged in response to the societal trauma of the wars and significantly impacted modern cinema. This movement's distinct visual style and thematic depth continue to influence filmmakers even today. Additionally, the study examines the perspectives of civilians and soldiers on cinema during wartime periods, revealing how films served as both escapism and a reflection of reality. Through various case studies, the study illustrates cinema's role in shaping and reflecting the collective consciousness during these pivotal historical moments. This exploration offers valuable insights into how The Great Wars reshaped the landscape of cinema and left a lasting cultural legacy.