Clute's articles on science fiction have appeared in many publications since the 1960s. He is a co-editor of "The Encyclopedia of Science Fiction" (with Peter Nicholls) and of "The Encyclopedia of Fantasy" (with John Grant), and "The Illustrated Encyclopedia Of Science Fiction". All three won Hugo Awards for Best Non-Fiction. He earned the Pilgrim Award from the Science Fiction Research Association for Lifetime Achievement in the field of science fiction scholarship, in 1994.