The novel by F. Scott Fitzgerald that explores the decadence and disillusionment of the Jazz Age in 1920s America is "The Great Gatsby." Published in 1925, "The Great Gatsby" tells the story of Jay Gatsby, a wealthy and enigmatic millionaire, through the eyes of the narrator, Nick Carraway. The novel vividly portrays the opulence, excesses, and social mores of the time, while also delving into themes of love, idealism, the American Dream, and the emptiness beneath the glittering façade of the Roaring Twenties. "The Great Gatsby" is considered one of the greatest American novels and a significant critique of the American society of its time.