- The StuttererAuthor: Reuben (Reuben Robert) MerlissLanguage: English
- The Talkative TreeAuthor: H. B. (Horace Bowne) FyfeLanguage: English
- The Time MachineAuthor: H. G. (Herbert George) WellsLanguage: English
- The Time TradersAuthor: Andre NortonLanguage: English
- The TroubadourAuthor: Robert A. W. (Robert Augustine Ward) LowndesLanguage: English
- The Ultimate ExperimentAuthor: DeKy, ThorntonLanguage: English
- The Ultimate WeaponAuthor: Campbell, John W., Jr. (John Wood)Language: English
- The Universe — or NothingAuthor: Meyer MoldevenLanguage: English
- The UntouchableAuthor: Stephen A. Kallis, Douglas [Illustrator]Language: English
- The Vortex BlasterAuthor: E. E. (Edward Elmer) Smith, John R. (John Robert) ForteLanguage: English
- The War in the AirAuthor: H. G. (Herbert George) WellsLanguage: English
- The War of the WenusesAuthor: Charles L. (Charles Larcom) Graves, E. V. (Edward Verrall) LucasLanguage: English
- The war of the worldsAuthor: H. G. (Herbert George) WellsLanguage: English
- The warlord of MarsAuthor: Edgar Rice BurroughsLanguage: English
- The Whispering SpheresAuthor: R. R. (Russell Robert) WinterbothamLanguage: English
- The White InvadersAuthor: Ray CummingsLanguage: English
- The Winds of TimeAuthor: James H. Schmitz, Brotman, Adolph E. [Illustrator]Language: English
- The Winged Men of Orcon: A Complete NoveletteAuthor: Sparks, David R.Language: English
- The Wolf's Long HowlAuthor: Stanley WaterlooLanguage: English
- The Worlds of IfAuthor: Stanley G. (Stanley Grauman) WeinbaumLanguage: English
- The WorshippersAuthor: Damon Knight, Ed EmshwillerLanguage: English
- The Yillian WayAuthor: Keith LaumerLanguage: English
- This World Is TabooAuthor: Murray LeinsterLanguage: English
- This World Must Die!Author: H. B. (Horace Bowne) FyfeLanguage: English
- Through Space to Mars; Or, the Longest Journey on RecordAuthor: Rockwood, RoyLanguage: English
- Thuvia, maid of MarsAuthor: Edgar Rice BurroughsLanguage: English
- Tight SqueezeAuthor: Dean IngLanguage: English
- Time and Time AgainAuthor: H. Beam Piper, Vincent NapoliLanguage: English
- Time CrimeAuthor: H. Beam Piper, Kelly FreasLanguage: English
- Timeline: A Terran Empire timelineAuthor: Wilson, AnnLanguage: English
- Tom Swift and His Submarine Boat; Or, Under the Ocean for Sunken TreasureAuthor: Appleton, VictorLanguage: English
- Tom Swift and the Electronic HydrolungAuthor: Appleton, Victor, II, Brey, Charles [Illustrator]Language: English
- Tono-BungayAuthor: H. G. (Herbert George) WellsLanguage: English
- Toy ShopAuthor: Harry Harrison, Brey, Charles [Illustrator]Language: English
- Traders RiskAuthor: Roger D. AycockLanguage: English
- Treachery in Outer SpaceAuthor: Rockwell, Carey, Willy Ley, Glanzman, Louis [Illustrator]Language: English
- TriplanetaryAuthor: E. E. (Edward Elmer) SmithLanguage: English
- Twenty Thousand Leagues under the SeaAuthor: Jules VerneLanguage: English
- Twenty Thousand Leagues Under the Seas: An Underwater Tour of the WorldAuthor: Jules Verne, Frederick Paul Walter, Milo WinterLanguage: English
- Uller UprisingAuthor: H. Beam Piper, John F. Carr, John D. (John Drury) ClarkLanguage: English
- Ullr UprisingAuthor: H. Beam PiperLanguage: English
- Unborn TomorrowAuthor: Mack Reynolds, Kelly FreasLanguage: English
- UnspecialistAuthor: Yaco, Murray F., Kelly FreasLanguage: English
- Untechnological EmploymentAuthor: Ed M. ClintonLanguage: English
- Valley of DreamsAuthor: Stanley G. (Stanley Grauman) WeinbaumLanguage: English
- Valley of the CroenAuthor: Tarbell, LeeLanguage: English
- Vanishing PointAuthor: C. C. (Charles Clarence) Beck, Martinez [Illustrator]Language: English
- VictoryAuthor: Lester Del ReyLanguage: English
- ViewpointAuthor: Randall GarrettLanguage: English
- VigorishAuthor: John Berryman, Petrizzo [Illustrator]Language: English
- Vijf weken in een luchtballonAuthor: Jules VerneLanguage: Dutch
- Vingt mille Lieues Sous Les Mers — CompleteAuthor: Jules VerneLanguage: French
- Vingt Mille Lieues Sous Les Mers — Part 1Author: Jules VerneLanguage: French
- Vingt Mille Lieues Sous Les Mers — Part 2Author: Jules VerneLanguage: French
- Voodoo PlanetAuthor: Andre NortonLanguage: English
- Voyage au Centre de la TerreAuthor: Jules VerneLanguage: French
- Vuonna 2000: Katsaus vuoteen 1887Author: Edward Bellamy, J. K. KariLanguage: Finnish
- Wandl the InvaderAuthor: Ray CummingsLanguage: English
- Warlord of KorAuthor: Terry CarrLanguage: English
- Warning from the StarsAuthor: Cocking, Ron, Leo SummersLanguage: English