Discworld is a comic fantasy book series written by the English author Terry Pratchett (1948–2015), set on the Discworld, a flat planet balanced on the backs of four elephants which in turn stand on the back of a giant turtle. The books frequently parody or take inspiration from J. R. R. Tolkien, Robert E. Howard, H. P. Lovecraft, Charles Dickens and William Shakespeare, as well as mythology, folklore and fairy tales, often using them for satirical parallels with cultural, political and scientific issues.
Forty-one Discworld novels have been published. The original British editions of the first 26 novels, up to Thief of Time (2001), had cover art by Josh Kirby. The American editions, published by Harper Collins, used their own cover art. Since Kirby's death in 2001, the covers have been designed by Paul Kidby. Companion publications include eleven short stories (some only loosely related to the Discworld), four popular science books, and a number of supplementary books and reference guides. The series has been adapted for graphic novels, theatre, computer and board games, and television.
Newly released Discworld books regularly topped The Sunday Times best-sellers list, making Pratchett the UK's best-selling author in the 1990s. Discworld novels have also won awards such as the Prometheus Award and the Carnegie Medal. In the BBC's Big Read, four Discworld novels were in the top 100, and a total of fourteen in the top 200. More than 80 million Discworld books have been sold in 37 languages.