The Sun Also Rises is a 1926 novel written by American author Ernest Hemingway about a group of American and British expatriates who travel from Paris to the Festival of San Fermín in Pamplona to watch the running of the bulls and the bullfights. Hemingway biographer Jeffrey Meyers writes that it is "recognized as Hemingway's greatest work", and Hemingway scholar Linda Wagner-Martin calls it his most important novel.

The basis for the novel was Hemingway's 1925 trip to Spain. The setting was unique and memorable, showing the seedy café life in Paris, and the excitement of the Pamplona festival, with a middle section devoted to descriptions of a fishing trip in the Pyrenees. Equally unique was Hemingway's spare writing style, combined with his restrained use of description to convey characterizations and action, which became known as the Iceberg Theory.

On the surface the novel is a love story between the protagonist Jake Barnes—a man whose war wound has made him impotent—and the promiscuous divorcée Lady Brett Ashley. Brett's affair with Robert Cohn causes Jake to be upset and break off his friendship with Cohn; her seduction of the 19-year-old matador Romero causes Jake to lose his good reputation among the Spaniards in Pamplona. The characters are based on real people and the action is based on real events. In the novel, Hemingway presents his notion that the "Lost Generation", considered to have been decadent, dissolute and irretrievably damaged by World War I, was resilient and strong. Additionally, Hemingway investigates the themes of love, death, renewal in nature, and the nature of masculinity.