Spacewarp was a science fiction fanzine by Art Rapp (1924-2005).
Art Rapp published his fanzine in Saginaw, Michigan from April 1947 until September 1950. Rapp was a member of the Michigan Science Fantasy Society.
Co-editor of the early issues were Bill Groover, with art by Bob Stein and contributions mainly by Wilkie Connor, Jack Clements, and Ben Singer (The Mutant).
Soon, other fans began contributing, with Redd Boggs being one of the first. His column in Spacewarp, "File 13", became well known and anticipated in SF fandom.
Other contributors included Forrest J Ackerman (Voice of the Imagi-Nation), Henry Andrew Ackerman, Michael De Angelis (Gargoyle), Warren Baldwin, Wrai Ballard, Redd Boggs (Chronoscope, Sky Hook), Donn Bratton, Donn Brazier (Frontier), Guerry C. Brown, W.E. Bullard, Charles Burbee (Shangri L'Affaires), Lyon de Coeur, Wilkie Conner, Arthur Jean Cox, Ed Cox (Altair, Triton), Paul D. Cox (Other Worlds, Worlds Apart), Jim Craig, Vaughn Greene, Andy Gregg, Charles Hames (Orb), Jim Harmon, William James, David H. Keller, Joe Kennedy (Vampire), F. Towner Laney (The Acolyte), Carl Lawrence, Al F. Lopez, Don McConnell, C. Stewart Metchette, Ray Nelson, Robert Parris, Rog Phillips, Hal Shapiro (STF & FSY Songbook), Rick Sneary (The Outlander, Moonshine), Genevieve K. Stephens (Loki), Charles Stuart, Bob Tucker (Le Zombie), Bill Venable (The Pendulum), James A. Wade, T. E. Watkins, and Wally Weber (Cry of the Nameless).
Contributing artists include Ralph Fluette, John Grossman (Scientifantasy), Ray Nelson, Art Rapp, Bill Rotsler, and Bob Stein.
After a meeting of the Michigan Science Fantasy Society in November of 1949, two members set off a bomb in the front yard of Rapp's home. Police were called and neighbours gathered, and according to Rapp in an open letter he wrote of the incident, the bomb was heard from two miles away. Immediately after, Rapp quit MSFS but didn't end his zine until the next year, when he left the U.S. for military duty in Korea. He then turned the zine over to F. Towner Laney and Charles Burbee to edit. They put out two issues, the last, in 1950, called the "Insurgent Issue".
During the years 1950-1952, Art Rapp was one of the co-editors of The National Fantasy Fan.
In 1983, Rapp resumed publishing Spacewarp as a member of the Spectator Amateur Press Society (SAPS).