The U.S.A. Trilogy is a series of three novels by American writer John Dos Passos, comprising the novels The 42nd Parallel (1930), 1919 (1932) and The Big Money (1936). The books were first published together in a volume titled U.S.A. by Harcourt Brace in January 1938.

The trilogy employs an experimental technique, incorporating four narrative modes, fictional narratives telling the life stories of twelve characters, collages of newspaper clippings and song lyrics labeled “Newsreel”, individually labeled short biographies of public figures of the time such as Woodrow Wilson and Henry Ford and fragments of autobiographical stream of consciousness writing labeled “Camera Eye”. The trilogy covers the historical development of American society during the first three decades of the 20th century. In 1998, the Modern Library ranked U.S.A. 23rd on its list of the 100 best English-language novels of the 20th century.