A
- Patricia Acevedo (Latin American dub: voice of computer)
- Pamela Adlon
- Rosy Aguirre (Latin American dub: voice of Wesley Crusher, additional voices)
- Marc Alaimo
- Chad Allen
- Mädchen Amick
- Erich Anderson
- John Anderson
- Sam Anderson
- Michael Ansara
- Lee Arenberg
- Vinny Argiro
- Gary Armagnac
- Vaughn Armstrong
- Shay Astar
- Erick Avari
- Laura Ayala (Latin American dub: voice of Tasha Yar)
Read more about this topic: List Of Star Trek: The Next Generation Cast Members