Viper is a science fiction fanzine by Bill Donaho.
Viper was released in the 1960s in the UK for distribution by the APA "OMPA", the Off-Trails Magazine Publishers Association.
Contributors included John Berry, Elinor Busby (Cry of the Nameless), with her column "Ho!", F.M. Busby (Cry of the Nameless), Terry Carr (Lighthouse), Al Halevy, George Locke, and Alva Rogers with a five part installment entitled "Requiem for 'Astounding'" .
Cover art was by Les Nirenberg (#2) (The Panic Button), Ray Nelson (#3), Jack Harness (#6 front cover), Bjo Trimble (#6 back cover)); interior art work was contributed by Lars Bourne, Art Castillo, J. Brian Donahoe, Jack Harness, Terry Jeeves, George Metzger, Ray Nelson, Les Nirenberg (Panic Button), Trina Robbins, Alva Rogers, Bill Rotsler, Pat Scott, and Arthur Thomson.