Seamonsters was a science fiction fanzine edited by Simone Walsh.
Seamonsters was published in London, England, in the 1970s. Four issues appeared, the last in August 1979.
The zine featured three regular columns; "Billy the Squid" by Greg Pickersgill, a column called "Condom" by Chris Priest, and Simone Walsh's own column.
At the same time as Seamonsters was being published, Simone Walsh was also writing a regular column for Greg Pickersgill's Stop Breaking Down.
Seamonsters was the winner of the Nova Award for Best Fanzine in 1979.