Is All Quiet on the Western Front a fictional book?

Yes, All Quiet on the Western Front is a fictional book. It was written by Erich Maria Remarque, a German veteran of World War I, and published in 1929.

While the novel draws heavily on Remarque's own experiences in the war, it is not an autobiography. It is a fictionalized account of the horrors and disillusionment of trench warfare, told through the eyes of a young German soldier named Paul Bäumer.