This question is difficult to answer because the most popular novels in the world depend on different indicators such as readership, sales, copyright revenue, etc. However, according to some of the novel rankings, the following are some of the most popular novels: 1 Harry Potter series: The magical fantasy novel by JK Rowling has been widely welcomed worldwide since its publication in 1997. 2. Twilight series: The romantic fantasy novel by Stephanie Meyer has been attracting a large number of readers since its publication in 2008. 3. Dream of the Red Chamber: Chinese classical novels are considered one of the greatest works in the history of Chinese literature and one of the most popular novels in the world. 4. Harry Potter and the Cursed Child: A magical fantasy novel by JK Rowling about how Harry Potter and his mother found and protected Harry after his father died. 5 Game of Thrones: A fantasy novel by George R. R. Martin about the struggles and political conspiracies between seven kingdoms, which has garnered a huge readership worldwide since its publication in 2011.