Option Lock
| Author | Justin Richards |
|---|---|
| Series | Doctor Who book: Eighth Doctor Adventures |
Release number | 8 |
| Subject | Featuring: Eighth Doctor Sam |
| Publisher | BBC Books |
Publication date | February 1998 |
| ISBN | 0-563-40583-X |
| Preceded by | Kursaal |
| Followed by | Longest Day |
Option Lock is an original novel written by Justin Richards and based on the long-running British science fiction television series Doctor Who. It features the Eighth Doctor and Sam.