Books about Human-alien encounters -- Fiction (sorted alphabetically)
- This World is Ours! Emil Petaja
- thought-feeders R. R. Winterbotham
- Thought-Men of Mercury R. R. Winterbotham
- Threlkeld's Daughter James Bell
- Thunder in the void Henry Kuttner
- Ticket to the Stars Raymond E. Banks
- Tiger by the Tail Poul Anderson
- Time of Cold Mary Carlson
- Time-Techs of Kra Max C. Sheridan
- time to die Harold Calin
- Today is Forever Roger D. Aycock
- To Save Earth Edward W. Ludwig
- To the sons of tomorrow Irving E. Cox
- Tourists to Terra Mack Reynolds
- Toy Kris Neville
- Traitor's Choice Paul W. Fairman
- Trajectory to Taurus Les Cole
- Transmutation of Muddles H. B. Fyfe
- Travelogue Roger D. Aycock
- Treasure of Triton Charles A. Baker
- Tree of Life C. L. Moore
- Triplanetary E. E. Smith
- Triplanetary E. E. Smith
- Trouble on Tycho Nelson S. Bond
- Try to remember! Frank Herbert