It was difficult to give a definite answer to the best of the 20th century in the world. This was because each of them had a different writing style and theme. The best of the 20th century, Faulkner. His works were often full of dark humor and dystopian topics such as The Sound and Fury, Glory, and Vikings in Australia. His best works of the 20th century were full of realism and modernist elements, such as The Sun Also Rises, A Farewell to Arms, and Notre-Dame de Paris. The best Potter author of the 20th century, JK Rowling. Her Wizarding World series was very popular with readers, such as Harry Potter and the Sorcerer's Stone and Harry Potter and the Chamber of Secrets. The best of the 20th century were also other excellent people such as Tolstoy, Hugo, Maugham, Dickens, Faulkner, Ernest Hemmingway, Calvino, Margaret Atwood, and so on. Each of them is worth appreciating and learning from.