1951

Novel: Farmer in the Sky, by Robert A. Heinlein (1950).
Novella: The Man Who Sold the Moon, by Robert A. Heinlein (1950).
Novelette: The Little Black Bag, by C. M. Kornbluth (Astounding, July, 1950).
Short story: To Serve Man, by Damon Knight (Galaxy, November, 1950).
Dramatic presentation: Destination Moon.
Professional editor: John W. Campbell, Jr.
Professional artist: Kelly Freas.

1946

Novel: The Mule, by Isaac Asimov (Astounding, November/December, 1945).
Novella: Animal Farm, by George Orwell.
Novelette: First Contact, by Murray Leinster (Astounding, May, 1945).
Short story: Uncommon Sense, by Hal Clement (Astounding, September, 1945).
Dramatic presentation: The Picture of Dorian Gray.
Professional editor: John W. Campbell, Jr.
Professional artist: Virgil Finlay.

Also see Hugo awards for science fiction
Also see Nebula awards for science fiction