Hearts of the World (also known as Love's Struggle) is a 1918 American silent melodrama and World War I propaganda film written, produced and directed by D. W. Griffith. In an effort to change the American public's neutral stance regarding the war, the British government contacted Griffith due to his stature and reputation for dramatic filmmaking.

Hearts of the World stars Lillian and Dorothy Gish and Robert Harron. The film was produced by D.W. Griffith Productions, Famous Players–Lasky Corporation and the War Office Committee was distributed by Paramount Pictures under the Artcraft Pictures Corporation banner.