Tor Doubles are a series of science fiction books published by Tor Books between 1988 and 1991, mostly in tête-bêche format. The series was inspired by the Ace Doubles, published between 1952 and 1973.
This list is complete and includes ISBN numbers for the United States.
| First book | Second book | Publication date | ISBN | ||
|---|---|---|---|---|---|
| 1 | Arthur C. Clarke A Meeting with Medusa | Kim Stanley Robinson Green Mars | October 1988 | 0-8125-3362-3 | |
| 2 | Greg Bear Hardfought | Timothy Zahn Cascade Point | November 1988 | 0-8125-5971-1 | |
| 3 | Robert Silverberg Born With The Dead | Brian W. Aldiss The Saliva Tree | December 1988 | 0-8125-5952-5 | |
| 4 | John Varley Tango Charlie and Foxtrot Romeo | Samuel R. Delany The Star Pit | January 1989 | 0-8125-5956-8 | |
| 5 | Poul Anderson No Truce With Kings | Fritz Leiber Ship of Shadows | February 1989 | 0-8125-5958-4 | |
| 6 | Barry B. Longyear Enemy Mine | John Kessel Another Orphan | March 1989 | 0-8125-5963-0 | |
| 7 | Vonda N. McIntyre Screwtop | James Tiptree, Jr. The Girl Who Was Plugged In | April 1989 | 0-8125-4554-0 | |
| 8 | Leigh Brackett The Nemesis From Terra | Edmond Hamilton Battle for the Stars | May 1989 | 0-8125-5960-6 | |
| 9 | Isaac Asimov The Ugly Little Boy | Theodore Sturgeon The [Widget], the [Wadget], and Boff | June 1989 | 0-8125-5966-5 | |
| 10 | Robert Silverberg Sailing to Byzantium | Gene Wolfe Seven American Nights | July 1989 | 0-8125-5924-X | |
| 11 | James Tiptree, Jr. Houston, Houston, Do You Read? | Joanna Russ Souls | August 1989 | 0-8125-5962-2 | |
| 12 | Roger Zelazny He Who Shapes | Kate Wilhelm The Infinity Box | September 1989 | 0-8125-5879-0 | |
| 13 | Kim Stanley Robinson The Blind Geometer | Ursula K. Le Guin The New Atlantis | October 1989 | 0-8125-0010-5 | |
| 14 | Poul Anderson The Saturn Game | Gregory Benford and Paul A. Carter Iceborn | November 1989 | 0-8125-0277-9 | |
| 15 | Jack Vance The Last Castle | Robert Silverberg Nightwings | December 1989 | 0-8125-0194-2 | |
| 16 | James Tiptree, Jr. The Color of Neanderthal Eyes | Michael Bishop And Strange At Ecbatan The Trees | January 1990 | 0-8125-5964-9 | |
| 17 | L. Sprague de Camp Divide and Rule | Leigh Brackett The Sword of Rhiannon | February 1990 | 0-8125-0362-7 | |
| 18 | C.L. Moore Vintage Season | Robert Silverberg In Another Country[1] | February 1990 | 0-8125-0193-4 | |
| 19 | Fritz Leiber Ill Met in Lankhmar | Charles de Lint The Fair in Emain Macha | March 1990 | 0-8125-0821-1 | |
| 20 | L. Sprague de Camp The Wheels of If | Harry Turtledove The Pugnacious Peacemaker | April 1990 | 0-8125-0202-7 | |
| 21 | Roger Zelazny Home is the Hangman | Samuel R. Delany We, In Some Strange Power's Employ, Move On A Rigorous Line | May 1990 | 0-8125-0983-8 | |
| 22 | Leigh Brackett The Jewel of Bas | Karen Haber Thieves' Carnival | June 1990 | 0-8125-0272-8 | |
| 23 | Norman Spinrad Riding The Torch | Joan D. Vinge The Tin Soldier | July 1990 | 0-8125-0551-4 | |
| 24 | Roger Zelazny The Graveyard Heart | Walter Jon Williams Elegy For Angels And Dogs | August 1990 | 0-8125-0275-2 | |
| 25 | John M. Ford Fugue State | Gene Wolfe The Death of Doctor Island | September 1990 | 0-8125-0813-0 | |
| 26 | John Varley Press Enter■ | Robert Silverberg Hawksbill Station | October 1990 | 0-8125-5948-7 | |
| 27 | Orson Scott Card Eye For Eye | Lloyd Biggle, Jr. The Tunesmith [2] | November 1990 | 0-8125-0854-8 | |
| 28 | Kim Stanley Robinson A Short Sharp Shock | Jack Vance The Dragon Masters | December 1990 | 0-8125-0895-5 | |
| 29 | Ian Watson Nanoware Time | John Varley The Persistence of Vision | January 1991 | 0-8125-5940-1 | |
| 30 | Poul Anderson The Longest Voyage | Steve Popkes Slow Lightning | March 1991 | 0-8125-1170-0 | |
| 31 | Gordon R. Dickson Naked To The Stars | Gordon R. Dickson The Alien Way | February 1991 | 0-8125-0396-1 | |
| 32 | Harlan Ellison Run For The Stars | Jack Dann and Jack C. Haldeman II Echoes of Thunder | April 1991 | 0-8125-1180-8 | |
| 33 | Mike Resnick Bwana | Mike Resnick Bully | May 1991 | 0-8125-1246-4 | |
| 34 | Damon Knight Rule Golden | Damon Knight Double Meaning | June 1991 | 0-8125-1294-4 | |
| 35 | Dean Ing Silent Thunder | Robert A. Heinlein Universe | July 1991 | 0-8125-0265-5 | |
| 36 | Fritz Leiber Conjure Wife | Fritz Leiber Our Lady Of Darkness [3] | August 1991 | 0-8125-1296-0 |
At least one more in the series was prepared but never published: Esther Friesner's Yesterday We Saw Mermaids paired with Lawrence Watt-Evans's The Final Folly of Captain Dancy would have been series number 37.[4]