| 1970 |
| Novel: | "Ringworld" by Larry Niven |
| Novella: | "Ill Met in Lankhmar" by Fritz Leiber |
| Novelette: | "Slow Sculpture" by Theodore Sturgeon |
| Short Story: | No Award |
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| 1971 |
| Novel: | "A Time of Changes" by Robert Silverberg |
| Novella: | "The Missing Man" by Katherine MacLean |
| Novelette: | "The Queen of Air and Darkness" by Poul Anderson |
| Short Story: | "Good News from the Vatican" by Robert Silverberg |
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| 1972 |
| Novel: | "The Gods Themselves" by Isaac Asimov |
| Novella: | "A Meeting With Medusa" by Arthur C. Clarke |
| Novelette: | "Goat Song" by Poul Anderson |
| Short Story: | "When It Changed" by Joanna Russ |
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| 1973 |
| Novel: | "Rendezvous With Rama" by Arthur C. Clarke |
| Novella: | "The Death of Doctor Island" by Gene Wolfe |
| Novelette: | "Of Mist, and Grass, and Sand" by Vonda McIntyre |
| Short Story: | "Love Is the Plan, the Plan is Death" by James Tiptree, Jr. |
| Dramatic Presentation: | Soylent Green |
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| 1974 |
| Novel: | "The Dispossessed" by Ursula K. Le Guin |
| Novella: | "Born With the Dead" by Robert Silverberg |
| Novelette: | "If the Stars Are Gods" by Gordon Eklund & Gregory Benford |
| Short Story: | "The Day Before the Revolution" by Ursula K. Le Guin |
| Dramatic Presentation: | Sleeper by Woody Allen |
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| 1975 |
| Novel: | "The Forever War" by Joe Haldeman |
| Novella: | "Home Is the Hangman" by Roger Zelazny |
| Novelette: | "San Diego Lightfoot Sue" by Tom Reamy |
| Short Story: | "Catch That Zeppelin" by Fritz Leiber |
| Dramatic Presentation: | Young Frankenstein by Mel Brooks & Gene Wilder |
| Special Plaque: | George Pal for his film work |
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| 1976 |
| Novel: | "Man Plus" by Frederik Pohl |
| Novell:a | "Houston, Houston, Do You Read?" by James Tiptree, Jr. |
| Novelette: | "The Bicentennial Man" by Isaac Asimov |
| Short Story: | "A Crowd of Shadows" by C. L. Grant |
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| 1977 |
| Novel: | "Gateway" by Frederik Pohl |
| Novella: | "Stardance" by Spider & Jeanne Robinson |
| Novelette: | "The Screwfly Solution" by Racoona Sheldon |
| Short Story: | "Jeffty is Five" by Harlan Ellison |
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| 1978 |
| Novel: | "Dreamsnake" by Vonda McIntyre |
| Novella: | "The Persistence of Vision" by John Varley |
| Novelette: | "A Glow of Candles, A Unicorn's Eye" by C. L. Grant |
| Short Story: | "Stone" by Edward Bryant |
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| 1979 |
| Novel: | "The Fountains of Paradise" by Arthur C. Clarke |
| Novella: | "Enemy Mine" by Barry B. Longyear |
| Novelette: | "Sandkings" by George R. R. Martin |
| Short Story: | "Giants" by Edward Bryant |
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