Books in Science Fiction (sorted alphabetically)
- Lease to Doomsday Lee Archer
- Leech Robert Sheckley
- Legacy James H. Schmitz
- Legion of Lazarus Edmond Hamilton
- Let 'Em Breathe Space! Lester Del Rey
- Letter of the Law Alan Edward Nourse
- Let There Be Light H. B. Fyfe
- Lex W. T. Haggert
- License to Steal Louis Newman
- Life Sentence James V. McConnell
- Lighter Than You Think Nelson S. Bond
- Lights on Precipice Peak Stephen Tall
- Link Alan Edward Nourse
- Lion Loose James H. Schmitz
- Little Fuzzy H. Beam Piper
- Little Journey Ray Bradbury
- Lonesome Hearts R. R. Winterbotham
- Lone Star Planet John J. McGuire and H. Beam Piper
- Longevity Therese Windser
- Long, Silvery Day Magnus Ludens
- Long Voyage Carl Jacobi
- Looking Backward, 2000 to 1887 Edward Bellamy
- Loot of the Void Edwin K. Sloat
- Lord of Death and the Queen of Life Homer Eon Flint
- Lords of the Stratosphere Arthur J. Burks