|Location||California State University, Long Beach|
|Dates||3-6 August 1990|
Mythcon 21 was the twenty-first annual Mythopoeic Society conference.
- Theme: Aspects of Love in Fantasy
- Guest of Honors: Diana L. Paxson (fantasy author and musician) and Patrick Wynne (fantasy artist and Tolkien linguist)
- Chairman: Jo Alida Wilcox
- Coordinator: Bill Welden