The seventh and final Harry Potter novel, Deathly Hallows, has been named the fans' favourite just one month after it was released.
JK Rowling's novel, which broke sales records on both sides of the Atlantic, came top of a poll of 45,000 fans conducted by MSN Entertainment.
The third book, The Prisoner Of Azkaban, came second while The Chamber Of Secrets was the least popular.
More than 11 million copies of Deathly Hallows were sold in just one day.
The novel rounds off the Harry Potter series, which follows the boy wizard through his school career.
It is a much darker novel than its predecessors, with several characters coming to a sticky end.
The English language edition was published simultaneously in more than 90 countries when it was released in July.
It smashed single-day sales records by shifting 2.7 million copies in the UK and 8.3 million in the US during its first 24 hours on the shelves.
The previous record for the fastest-selling book was held by the sixth Harry Potter novel, The Half-Blood Prince, which sold nine million in its first day in 2005.
The movie version of Harry Potter and the Deathly Hallows, in which Daniel Radcliffe will appear as the teenage wizard for the final time, is not expected to hit cinema screens until 2010.