L
- David Lander
- Rosalyn Landor
- Peter Lauritson
- Ed Lauter
- Marc Lawrence
- Sabrina Le Beauf
- Lance LeGault
- Mark Lenard
- Aracelli de Leon (Latin American dub: voice of Deanna Troi)
- Richard Lineback
- Benjamin W.S. Lum
- Barry Lynch
- Richard Lynch
Read more about this topic: List Of Star Trek: The Next Generation Cast Members