- 1955
- Vice-President, Literary Staff, Euclid High School
- 1957
- 1959
- 1965
- NEBULA - Best Novelette - The Doors of His Face, the Lamps of His Mouth
- NEBULA - Best Novella - He Who Shapes
- 1966
- HUGO - Best Novel - ...And Call Me Conrad
- 1968
- HUGO - Best Novel - Lord of Light
- 1972
- Prix Apollo - Isle of the Dead
- 1974
- Guest of Honor - World Science Fiction Convention
- 1975
- NEBULA - Best Novella - Home is the Hangman
- 1976
- American Library Association
- Best Book for Young Adults - Doorways in the Sand
- HUGO - Best Novella - Home is the Hangman
- 1977
- DITMAR - Best Novel - The Hand of Oberon
- 1980
- Balrog - Best Short Fiction - Last Defender of Camelot
- 1982
- HUGO - Best Novelette - Unicorn Variations
- 1984
- Balrog - Best Collection - Unicorn Variations
- Locus - Best Collection - Unicorn Variations
- Seiun - Best Foreign Short Story - Unicorn Variations
- 1986
- HUGO - Best Novella - 24 Views of Mount Fuji, by Hokusai
- Locus - Best Fantasy Novel - Trumps of Doom
- 1987
- HUGO - Best Novelette - Permafrost
- 1990
- Western Reserve Alumni Association Creative Achievement Award
- 1995
- Euclid Public Schools Alumni Association Distinguished Achievement Hall of Fame
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