James Colvin was a pseudonym used by Michael Moorcock on several short stories appearing in New Worlds in the 1960s to disguise the amount of material Moorcock (who then edited the magazine) was contributing.
The name was used on several of the magazine's book reviews, but it is thought that some of these were written by others.
Colvin was officially killed off in a 1970 issue of the magazine. His obituary stated that Colvin had died from pneumonia after being crushed by a toppled filing cabinet.