The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 20th Century (1 member)
- 2409 deaths (1 member)
- 24th Century Starships (5 members)
- 24th century births (2 members)
- 30 Worlds (18 members)
- ASDB design studies (2 members)
- A Flight to Remember (21 members)
- Abbé class starship (10 members)
- Abbé class starships (3 members)
- Acclamator class starships (1 member)
- Achernar subclass starships (70 members)
- Achilles class starships (2 members)
- Active RPGs (5 members)
- Actor (1 member)
- Adamant class starships (8 members)
- Administration (5 members)
- Administrative templates (20 members)
- Administrators (6 members)
- Advanced English speakers (2 members)
- Advanced Portuguese speakers (2 members)
- Advanced Spanish speakers (5 members)
- Advanced Starship Design Bureau (website) (45 members)
- Adventure (2 members)
- Adventures of STAG (13 members)
- Aenar (2 members)
- Aesir (5 members)
- Agencies (42 members)
- Aircraft (1 member)
- Akira class starships (72 members)
- Aktevans (1 member)
- Akula subclass starships (11 members)
- Akyazi class starships (90 members)
- Akyazi subclass starships (34 members)
- Albacore class starships (2 members)
- Aldebaran (6 members)
- Aldebaraners (5 members)
- Aleo class starships (6 members)
- Alerts (8 members)
- Algonquin class starships (1 member)
- Alpha Centauri (11 members)
- Alpha Quadrant (57 members)
- Alpha Quadrant planets (69 members)
- Alpha and Beta Quadrant (14 members)
- Alternate realities (10 members)
- Alternate timelines (3 members)
- Ambassador class starships (69 members)
- Ambassadors (24 members)
- America class starships (2 members)
- Andernach class starships (1 member)
- Andorian (1 member)