Sir Thursday

Sir Thursday
First Australian edition
AuthorGarth Nix
Cover artistSandra Nobes/Hofstede Design (paperback, Allen & Unwin)
LanguageEnglish
SeriesThe Keys to the Kingdom
GenreFantasy
PublisherScholastic Paperbacks (US)
Allen & Unwin (AUS)
HarperCollins (UK)
Publication date
1 March 2006
Publication placeAustralia
Media typePrint (paperback & hardcover)
Pages427
ISBN0-439-70087-6
OCLC61229579
LC ClassPZ7.N647 Sir 2006
Preceded byDrowned Wednesday 
Followed byLady Friday 

Sir Thursday is a young adult fantasy novel written by Australian author Garth Nix. It is the fourth book in the series The Keys to the Kingdom, and was released in March 2006. Sir Thursday continues from the preceding book, following the adventures of a boy named Arthur as he attempts to claim mastership of the fourth part of a magical world. As with the other books in the series, the theme of 'seven' is prevalent, along with the themes of sin and virtue. The book received generally favourable critical response, but was criticised for a slow pace, among other issues.