| The Poison Seas | |
| Publisher: | Big Finish Productions |
| Series: | Professor Bernice Summerfield |
| Number: | 4.3 |
| Cover: | Poison Seas.jpg |
| Director: | Edward Salt |
| Producer: | Gary Russell |
| Date: | September 2003 |
| Length: | 70 minutes |
The Poison Seas is a Big Finish Productions audio drama featuring Lisa Bowerman as Bernice Summerfield, a character from the spin-off media based on the long-running British science fiction television series Doctor Who.
Bernice returns to the planet Chosan to help a Sea Devil colony who are under threat from terrorists. She soon realises that the colony, and the entire planet, is actually in danger from something far worse.