 | This article consists almost entirely of a plot summary. (January 2021) |
 First edition (US) | |
| Author | Garth Nix |
|---|---|
| Cover artist | John Blackford |
| Language | English |
| Series | The Keys to the Kingdom |
| Genre | Fantasy, Young adult novel |
| Publisher | Scholastic Press (US) Allen & Unwin (Australia) HarperCollins (UK) |
Publication date | 1 July 2003 (US) |
| Publication place | Australia |
| Media type | Print (Paperback) |
| Pages | 445 |
| ISBN | 0-439-55123-4 |
| OCLC | 52498186 |
| LC Class | PZ7.N647 Mi 2003 |
| Followed by | Grim Tuesday |
Mister Monday is the first novel in the series The Keys to the Kingdom by Garth Nix. It follows Arthur Penhaligon, a twelve-year-old boy who discovers that he is the heir to an otherworldly House and must fulfil a mysterious Will in order to claim it from seven antagonistic Trustees.