The 39th World Science Fiction Convention (Worldcon), also known as Denvention II, was held September 3–7, 1981, at the in Denver, Colorado, United States. The chairmen were and . The guests of honor were Clifford D. Simak (pro), C. L. Moore (pro), and Rusty Hevelin (fan). Extra special guest was Robert Heinlein who had been the guest of honor at the 1941 Worldcon, the first to be held in Denver. The toastmaster was Ed Bryant. Total attendance was 3,792.
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