Books about Human-alien encounters -- Fiction (sorted alphabetically)
- Is That You Xeluchli? Dick Hetschel
- It Hayden Howard
- Jabberwock, Beware! Richard A. Sternbach
- Jackie sees a star Marion Zimmer Bradley
- Jameson Satellite Neil R. Jones
- Jimsy and the Monsters Walter J. Sheldon
- Joe Carson's Weapon James R. Adams
- Juggernaut of Space Ray Cummings
- Jupiter's Joke A. L. Haley
- Kid Stuff Winston K. Marks
- Klygha H. B. Fyfe
- Laboratory Jerome Bixby
- Lair of the Dragonbird Robert Silverberg
- Lamps of the Angels Richard Sabia
- Lani People Jesse F. Bone
- Last Laugh Bryce Walton
- Last Martian Ray Van Houten
- Last Monster Gardner F. Fox
- Last Victory Tom Godwin
- leaf Robert F. Young
- Learning Theory James V. McConnell
- Leave, Earthmen—Or Die! John Massie Davis
- Left hand, right hand James H. Schmitz
- Lesson for Today Joel Nydahl
- License to Steal Louis Newman