These are in no particular order besides the first two. And all 7 Harry Potter books count as "one"... obviously. You cannot just pick one Harry Potter book to be a favorite on a list like this.
  1. Harry Potter (series) by J.K. Rowling
  2. Jurassic Park by Michael Crichton
  3. Animal Farm by George Orwell
  4. The Lovely Bones by Alice Sebold
  5. The Great Gatsby by F. Scott Fitzgerald
  6. Little Women by Louisa May Alcott
  7. Invisible Monsters by Chuck Palahniuk