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.
Contributors included Chris Atkinson (Start Breaking Up, Solo Flight), Alan Dorey (Gross Encounters), Ann Looker, and Don West.
The zine featured three regular columns; "Billy the Squid" by Greg Pickersgill (Rastus Johnson's Cakewalk), a column called "Condom" by Chris Priest, and Simone Walsh's own column.
Seamonsters was the winner of the Nova Award for Best Fanzine in 1979.