He's been knighted.
The writer, 60, who is best known for his hugely popular Discworld series of comic fantasy novels, received the honour for services to literature.
Sir Terry announced in December 2007 that he had been diagnosed with early-onset Alzheimer's disease.
He has since campaigned to raise awareness of the condition.
Terry Pratchett has sold more than 55 million books worldwide and has had his works translated into 33 languages.
Born in April 1948 in Beaconsfield, and educated at High Wycombe Technical High School, Sir Terry sold his first story when he was 13 years old and used the money to buy a second-hand typewriter.
I have spent many happy hours with his books, and I know my daughter Abby has, as well. Congratulations, Terry, and I hope to read many more of your books in the future.