Best Selling Books Of All Time

1. Don Quixote ( Original Title : El Ingenioso Hidalgo Don Quijote de la Mancha )

Written By : Miguel de Cervantes
Original Language : Early Modern Spanish
First Published : 1905 (Part One) & 1912 (Part Two)
Approximate Sales : 500 million
Genre : fiction: fantasy (novel)

2. A Tale of Two Cities

Written By : Charles Dickens
Original Language : English
First Published : 1859
Approximate Sales : 200 million
Genre : historical (novel)

3. The Lord of the Rings

Written By : J. R. R. Tolkien
Original Language : English
First Published : 1954–1955
Approximate Sales : 150 million
Genre : fiction: fantasy (novel)

4. The Little Prince ( Le Petit Prince ) 

Written By : Antoine de Saint-Exupéry
Original Language : French
First Published : 1943
Approximate Sales : 140 million
Genre : fiction (novel)

5. Harry Potter and the Philosopher's Stone

Written By : J. K. Rowling
Original Language : English
First Published : 1997
Approximate Sales : 120 million
Genre : fiction: fantasy (novel)

6. The Hobbit

Written By : J. R. R. Tolkien
Original Language : English
First Published : 1937
Approximate Sales : 100 million
Genre : fiction: fantasy (novel)

7. And Then There Were None

Written By : Agatha Christie
Original Language : English
First Published : 1939
Approximate Sales : 100 million
Genre : fiction: mystery (novel)

8. Dream of the Red Chamber ( Original Title : 紅樓夢/红楼梦, Also Called : The Story of the Stone) 

Written By : Cao Xueqin
Original Language : Vernacular Chinese
First Published : 1791
Approximate Sales : 100 million
Genre : fiction: family saga (novel)

9. The Lion, the Witch and the Wardrobe

Written By : C. S. Lewis
Original Language : English
First Published : 1950
Approximate Sales : 85 million
Genre : fiction: fantasy (novel)

10. She: A History of Adventure

Written By : H. Rider Haggard
Original Language : English
First Published : 1887
Approximate Sales : 83 million
Genre : fiction: fantasy, adventure, romance and Gothic (novel)

Honourable Mention : The Da Vinci Code, The Alchemist, Think and Grow Rich & every book of Harry Potter series 

Source : Wikipedia, Ranker, The Guardian, Business Insider