The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 4K Ultra HD Blu-rays (23 members)
- 892-IV natives (10 members)
- ACE Eddie Award nominees (2 members)
- ADG Excellence in Production Design Award nominees (51 members)
- ADG Excellence in Production Design Award winners (5 members)
- ALMA Award nominees (6 members)
- ALMA Award winners (2 members)
- ASCAP Film and Television Music Award nominees (1 member)
- ASCAP Film and Television Music Award winners (7 members)
- ASC Award nominees (2 members)
- Aaamazzarites (2 members)
- Aamaarazans (3 members)
- Abaddon's species (5 members)
- Abbreviations (211 members)
- Abdon's species (4 members)
- Academic disciplines (173 members)
- Academic disciplines (retconned) (1 member)
- Academy Award nominees (34 members)
- Academy Award winners (3 members)
- Acamarians (20 members)
- Activity books (25 members)
- Addix's species (4 members)
- Aenar (7 members)
- After Trek episodes (15 members)
- After Trek guests (26 members)
- Agencies (50 members)
- Agriculture (66 members)
- Akaali (5 members)
- Akoszonam (5 members)
- Akoszonams (0 members)
- Akritirians (8 members)
- Alcoholic beverages (176 members)
- Aldeans (9 members)
- Alerts (72 members)
- Algolians (2 members)
- Aliases (150 members)
- Allasomorphs (4 members)
- Allos' species (3 members)
- Alshains (3 members)
- Alternate reality (171 members)
- Alternate reality inhabitants (26 members)
- Alternate reality timeline (16 members)
- Ambassadors (81 members)
- Analyses (57 members)
- Anatomy (269 members)
- Andorans (3 members)
- Andoria (34 members)
- Andorian Imperial Guard personnel (10 members)
- Andorian starship classes (8 members)
- Andorian starships (5 members)