Eaton Award  
for best critical book, to 2001; since 2008, for lifetime achievement, juried 
 
 
Hugo Awards  
for SF/F works, voted by members of annual World Science Fiction Convention 
 
 (3 nominations; 3 wins)
 
 
The Encyclopedia of Science Fiction (
John Clute &  PN, eds.) (Orbit; St. Martin's)
  nonfiction book  
winner 
 
The Science Fiction Encyclopedia   (Doubleday)
  nonfiction book  winner
 
 
 (2 nominations; 2 wins)
 
The Encyclopedia of Science Fiction, Third Edition (
John Clute,  PN & 
David Langford, eds.) (SF Gateway)
  nonfiction  
winner 
 
The Encyclopedia of Science Fiction (
John Clute &  PN, eds.) (Orbit)
  special award  
winner 
 
 
 
 
Locus Awards  
for SF/F/H works, polled by readers of Locus Magazine 
 
 (2 nominations; 2 wins)
 
The Encyclopedia of Science Fiction (
John Clute &  PN, eds.) (Orbit; St. Martin's)
  nonfiction  
winner 
 
The Science Fiction Encyclopedia   (Doubleday)
  related nonfiction book  winner
 
Ditmar Awards  
for Australian SF/F, voted by members of Australian National SF Convention 
 
 (3 nominations; 1 win)
 
  
committee award  winner
 
“Fantastic World” (reviews)   (Melbourne Sunday Herald)
  William Atheling Jr. Award for Criticism or Review  nomination
 
“Plumbers of the Cosmos” (by 
George Turner &  PN) (
SF Commentary #48/49/50)
  William Atheling Jr. Award for Criticism or Review  nomination