 | This article consists almost entirely of a plot summary. (January 2021) |
 Australian Cover | |
| Author | Garth Nix |
|---|---|
| Cover artist | Sandra Nobes / Hofstede Design (paperback, Allen & Unwin) |
| Language | English |
| Series | The Keys to the Kingdom |
| Genre | Fantasy, Young adult novel |
| Publisher | HarperCollins (UK) Scholastic Press (USA) Allen & Unwin (Australia) |
| Publication place | Australia |
| Media type | Print (hardback & paperback) |
| Pages | 278 |
| ISBN | 0-00-717509-4 |
| OCLC | 76359863 |
| Preceded by | Sir Thursday |
| Followed by | Superior Saturday |
Lady Friday is the fifth novel by Garth Nix in his The Keys to the Kingdom series.