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- Ejler Jakobsson (1911–1986), editor for a number of pulp magazines
- Toni Jerrman, editor of influential Finnish science fiction magazine Tähtivaeltaja
- Karl Johanson (born 1962 in Victoria Canada), editor of Neo-opsis Science Fiction Magazine
- Stephen Jones (born 1953), British horror anthologist
- S. T. Joshi (born 1958 in Pune, India), editor of many collections of short stories
Read more about this topic: List Of Science Fiction Editors