Granfalloon was a science fiction fanzine published by Linda Bushyager.
The first issue was published in 1966 in Pittsburgh, Pennsylvania, U.S.A.. Suzanne Tompkins was co-editor for the first six issues. Twenty issues of Granfalloon were released, the last one in July 1976.
Writers include Piers Anthony, Ginjer Buchanan, Ron Bushyager, Jesus Cummings, Don D'Ammassa, D. Dinucci, Mike Glicksohn (Energumen), Arnie Katz (Vegas Fandom Weekly), Damon Knight, Frank Lunney, Sandra Miesel, Ron Miller, Andy Offut, Jodie Offutt, Robert Silverberg (Spaceship), Jeff Smith, Darrell Schweitzer, Mae Strelkov, Bob Tucker (Le Zombie), Harry Warner, Jr. (Horizons), Ted White, Susan Wood (Aspidistra, Energumen), and Roger Zelazny.
Artists include Alicia Austin, Bill Bowers (Outworlds), Grant Canfield, Richard Delap, Steve Fabian, Connie Reich Faddis, Dick Flinchbaugh, George Foster, Mike Gilbert, Alexis Gilliland, Howard Green, C. Lee Healy, Terry Jeeves, Eddie Jones, Tim Kirk, Sandra Miesel, Ron Miller, Pauline Palmer, Andy Porter, Terry Romine, Bill Rotsler, and Bernie Zuber.
Granfalloon won the Hugo Award for Best Fanzine in 1972.
Linda Bushyagan also published the fanzine Karadss in the 1970s.