In Wikipedia’s list of best-selling single-volume books of all time, only a few days after its launch Harry Potter and the Deathly Hallows is already no.12 on the all-time list, having sold 72 million copies 2 days after its launch on 21st July 2007. It is not yet the best-selling book in the series (that title belongs to the first book in the series, Harry Potter and the Philosopher’s Stone (known as Harry Potter and the Sorcerer’s Stone in the USA)
, released 1997 and has sold 107 million copies, and at no.9 on the all-time list), but judging from the rate at which it is selling, looks destined to do so. Goodness knows what number it will eventually reach.
In comparison, the best selling book of all time is The Holy Bible, which has sold in the region of 5 to 6 billion copies. However, it should be noted that The Holy Bible has had a few hundred (or even thousands) of years head start, and is still selling now.
The rest of the all-time top 10 list is primarily made up of religious or political-type books, as listed below:

















