Charlie and the Chocolate Factory, Matilda, James and the Giant Peach... Roald Dahl wrote some of Britain's best-loved children's books.
Now a campaign's been started to save the hut at the bottom of his garden, where Dahl wrote many of his stories, as it's in danger of falling apart.
It's Roald's birthday today - 13 September - and this year it's 50 years since James and the Giant Peach was published.
So we want to know, what's your favourite Roald Dahl book and why do you love it so much?
Perhaps you're a BIG fan of the BFG? Maybe you dream about getting a golden ticket to the chocolate factory? Do you wish you had supernatural powers like Matilda?
Thanks for all your comments but this page is now closed.
"I love the witches I've liked it for a very long time!"
Ashleigh, 13, Australia
"I have nearly finished my entire collection of Roald Dahl books. I read them over and over again. They are all very good but my favourite books are Matilda and The Magic Finger."
Anne, 12, London, England
"I could never pick a fave book as I love them all! He was such an amazing writer and I wish him happy birthday"
Lia, 11, Brighton, England
"My favourite Roald Dahl book is The Twits, it is so funny. My other favourite book is Matilda, to be honest I like any Roald Dahl books!"
Emily, 11, Hull, England
"I have to say Matilda but Charlie and the Chocolate Factory is a close second."
Lynsey, 12, N. Ireland
"I love The BFG. It's my favourite book."
Lucia, 7, Exeter
"I love Fantastic Mr Fox. It is the best."
Amarite, 11, London, England
"I love all of the Roald Dahl books and have a whole shelf dedicated to the books as I have them all. But my favourite would have to be Matilda as (this is going to sound extremely arrogant) she reminds me of myself."
Izzy, 11, Plymouth, England
"Mine are Esio Trot and The Witches!"
Monica, 8, Merseyside, England
"My favorite book is The Witches! He makes it feel real and it's really funny when the witches have flat feet!"
Simran, 10, Surrey, England
"I love The Witches! It's really good!"
Katie, 11, Belfast, N. Ireland
"Mine is George's Marvelous Medicine!"
Lola, 9, London, England
"I like Danny the Champion of the World and Esio Trot... I can't choose!"
Ishbel, 10, Scotland
"My fave Roald Dahl book is Boy: Tales of Childhood and The BFG. I've got nearly all the Roald Dahl books!
Mari, 11, Wales
"I really love his books and I'm reading Danny the Champion of the World! It's a great book and I love the great ideas that he puts into his books."
Serena, 10, Oxford, England
"Oooh this is a tricky one! I read many Roald Dahl books in school and on my own, but my favourite would have to be Matilda!"
Louise, 11, Ireland
"I love the BFG!"
Aimee, 8, Blackpool, England
"I like Charlie And The Chocolate Factory."
Josie, 7, Scotland
"My favourite book is Fantastic Mr. Fox!"
Mima, 11, Manchester, England