The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Battlestar Wiki matrix templates (9 members)
- Battlestar Wiki policies (62 members)
- Battlestar Wiki proposed policies (12 members)
- Battlestar Wiki reference templates (2 members)
- Battlestar Wiki tutorial (14 members)
- Battlestars (33 members)
- Battlestars (RDM) (14 members)
- Battlestars (TOS) (13 members)
- Behind the Scenes (307 members)
- Beings of Light (1 member)
- Black Market (84 members)
- Black is the Color of My True Love's Hair (1 member)
- Blocked Battlestar Wiki users (1 member)
- Blood & Chrome (3 members)
- Blood and Chrome (80 members)
- Blood on the Scales (46 members)
- Blowback (26 members)
- Blu-rays (12 members)
- Blu-rays (RDM) (8 members)
- Blu-rays (Region 1) (3 members)
- Blu-rays (Region 2) (5 members)
- Books (64 members)
- Books (Richard Hatch) (28 members)
- Boomer (TOS) (1 member)
- Borellian Nomen (7 members)
- Bots (4 members)
- CAP (1 member)
- Cain (TOS) (1 member)
- Candidates for deletion (25 members)
- Candidates for protection (0 members)
- Candidates for speedy deletion (1 member)
- Caprica (71 members)
- Caprica (RDM) (31 members)
- Caprica (TOS) (1 member)
- Caprica (series) (458 members)
- Caprica Buccaneers (1 member)
- Caprica pilot (3 members)
- Card Game (3 members)
- Cast (675 members)
- Cast (1980) (86 members)
- Cast (2003 Video Game) (8 members)
- Cast (BAC) (7 members)
- Cast (Caprica) (126 members)
- Cast (Deadlock) (10 members)
- Cast (RDM) (432 members)
- Cast (TOS) (142 members)
- Cast (TRS) (14 members)
- Cast (TSC) (4 members)
- Categories to be Cleaned Up (0 members)
- Characters (1,161 members)