| The Medusa Effect | |
| Cover Artist: | Mark Salwowski |
| Author: | Justin Richards |
| Series: | Doctor Who book: Virgin New Adventures |
| Release Number: | 12 |
| Subject: | Featuring: Bernice Summerfield |
| Release Date: | April 1998 |
| Publisher: | Virgin Books |
| Isbn: | 0-426-20524-3 |
| Preceded By: | Oblivion |
| Followed By: | Dry Pilgrimage |
The Medusa Effect is an original novel by Justin Richards featuring the fictional archaeologist Bernice Summerfield. The New Adventures were a spin-off from the long-running British science fiction television series Doctor Who.