The Undersea Tube
L. Taylor Hansen
Undertow
Elizabeth Bear
Undone
James Patrick Kelly
Undying World
Roland J. Green
Richard Blade Adventures (8)
Uneasy Alliances
Robert Asprin & Lynn Abbey
Thieves' World (11)
Unfallen Dead
Mark Del Franco
Connor Grey (3)
The Unforsaken Hiero
Sterling E. Lanier
Hiero Desteen (2)
The Unicorn Trade
Poul Anderson & Karen Anderson
The Unit
Ninni Holmqvist
The United States of Atlantis
Harry Turtledove
Lost Continent of Atlantis (2)
Universe 7
Terry Carr
Universe (7)
The Universe Twister
Keith Laumer
Lafayette O'Leary (1)
The Unknown Soldier
Sean Williams & Shane Dix
Cogal (1)
Unnatural History
Jonathan Green
Pax Britannia (1)
The Unnecessary Man
Randall Garrett
The Unthinking Destroyer
Rog Phillips
Until Relieved
Rick Shelley
13th Spaceborne (1)