The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Main Characters (1980) (6 members)
- Main Characters (BAC) (1 member)
- Main Characters (Caprica) (1 member)
- Main Characters (RDM) (22 members)
- Main Characters (TOS) (14 members)
- Main Characters (TRS) (3 members)
- Main Page Templates (1 member)
- Majestic Studios (1 member)
- Major Stub Pages (49 members)
- Male Galactipedian (35 members)
- Marvel (1 member)
- Marvel Comics (28 members)
- Marvel comics (1 member)
- Master Replicas (2 members)
- Mathematical templates (17 members)
- Maximum Press comics (27 members)
- Memoirs (1 member)
- Mentioned-Only (73 members)
- Mentioned-Only (Caprica) (1 member)
- Mentioned-Only (RDM) (32 members)
- Mentioned-Only (TOS) (41 members)
- Mentioned-Only Characters (9 members)
- Mentioned-Only Characters (1980) (6 members)
- Mentioned-Only Characters (BAC) (1 member)
- Mentioned-Only Characters (Caprica) (3 members)
- Mentioned-Only Characters (RDM) (78 members)
- Mentioned-Only Characters (TOS) (28 members)
- Mentioned-Only Characters (TOS-RH) (2 members)
- Mentioned-Only Characters (TRS) (5 members)
- Merchandise (184 members)
- Merchandise (TOS) (3 members)
- Miniseries (3,753 members)
- Miniseries, Night 1 (133 members)
- Miniseries, Night 2 (41 members)
- Misc. Citation templates (2 members)
- Misc. Templates (9 members)
- Moons (5 members)
- Moons (RDM) (2 members)
- Moons (TOS) (1 member)
- Murder on the Rising Star (103 members)
- Music (1 member)
- Musicians (5 members)
- Musicians (Caprica) (2 members)
- Musicians (RDM) (4 members)
- Musicians (TOS) (1 member)
- Musicians (TRS) (4 members)
- NPOV disputes (6 members)
- Navigational Infobox (68 members)
- News (The Caprican) (39 members)
- No Exit (62 members)