| Castle | |
| Author: | Garth Nix |
| Illustrator: | Steve Rawlings |
| Cover Artist: | Madalina Stefan |
| Country: | Australian |
| Language: | English |
| Series: | The Seventh Tower |
| Genre: | Fantasy novel |
| Publisher: | Scholastic |
| Release Date: | September 2000 |
| Media Type: | Print (Paperback) |
| Pages: | US:224 |
| Isbn: | 0-439-17683-2 |
| Congress: | CPB Box no. 1880 vol. 18 |
| Oclc: | 45080971 |
| Preceded By: | The Fall |
| Followed By: | Aenir |
Castle is the second book in Garth Nix's The Seventh Tower series, published on 1 November 2000 by Scholastic.[1] The cover design and art are by Madalina Stefan and Steve Rawlings respectively.
Tal and Milla make it from the shadowy 'Dark World' to the titular castle, a seeming place of peace. Both are unwanted by the castle's inhabitants, Milla the most. The two must avoid conspiracies and other dangers inside the castle, just to survive.