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. The first issue appeared in December 1960, and the final issue, #9, was published in June 1965.
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, Len Mofatt, Alva Rogers with a five part installment entitled "Requiem for 'Astounding'", Jack Speer, and Ted White. Issues 8 and 9 were both written entirely by Bill Donaho.
Cover art was by Ray Nelson (#1 and #3), Les Nirenberg (#2) (The Panic Button), Jack Harness (#6 and #7 front cover), Bjo Trimble (#6 back cover)); interior art work was contributed by Lars Bourne, Art Castillo, J. Brian Donahoe, Cynthia Goldstone, Jack Harness, Terry Jeeves, George Metzger, Ray Nelson, Les Nirenberg (Panic Button), Trina Robbins, Alva Rogers, Bill Rotsler, Pat Scott, and Arthur Thomson.
Bill Donaho also published Habakkuk.