John Francis Carr (born 1944) is a science fiction editor and writer. His works include the space opera The Ophidian Conspiracy and several novels (some co-written with Roland J. Green) set in the Paratime universe of H. Beam Piper.
Carr is also recognized as an editor, having edited numerous collections or series involving Libertarian science fiction and Military science fiction. He often works with Jerry Pournelle and may be best known for this. In 2002 Carr and Pournelle were honored with a Prometheus Award for editing The Survival of Freedom.
A list of Carr's published monographs: Ophidian Conspiracy 1975, Pain Gain 1976, Carnifex Mardi Gras 1982, Great Kings' War (with Roland J. Green) 1985, Kalvan Kingmaker 2001, Siege of Tarr-Hostigos 2004, Great Kings' War (revised edition) 2006, War World: The Battle of Sauron (with Don Hawthorne) 2007, H. Beam Piper: A Biography 2008
Anthologies editied or co-edited by Carr:The Survival of Freedom,Black Holes,Nebula Award Stories Sixteen,The Science Fiction Yearbook,9 volumes of There Will Be War,4 volumes of The Endless Frontier,3 volumes of Imperial Stars,7 volumes of the shared-world anthology series, War World
Carr also edited five H. Beam Piper story collections: Federation, Empire, Paratime, The Worlds of H. Beam Piper and The Complete Paratime.