The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- Mingender (4 members)
- Miscellaneous sexuality (1 member)
- Moirallegic (1 member)
- Monospec (1 member)
- Monsterboyic (15 members)
- Monsterenbyic (13 members)
- Monstergender (2 members)
- Monstergirlic (37 members)
- Mortugender (7 members)
- Moviegender (2 members)
- Mspec (179 members)
- Mspec Flag (1 member)
- Mspec Gay (6 members)
- Multigender (270 members)
- Musicagender (156 members)
- Musicgender (22 members)
- Musicorum System (8 members)
- Mutogender (223 members)
- Mutosexual (1 member)
- Mystian System (13 members)
- Mythical Creature System (15 members)
- Mythogender (29 members)
- NBLF (7 members)
- NBLM (7 members)
- NEIN (1 member)
- NERVIN (1 member)
- NEUIN (1 member)
- NHLNH (4 members)
- NIA/NIN Attraction (109 members)
- NIN (58 members)
- NINgender (1 member)
- NLN (1 member)
- NOCTIN (1 member)
- NOHIN (14 members)
- NONBIN (41 members)
- NOSIN (5 members)
- NOUIN (1 member)
- NOVIN (1 member)
- NUIN (1 member)
- NUOIN (54 members)
- NUTRIN (1 member)
- Naturegender (3 members)
- Naturogender (120 members)
- Navbox templates (0 members)
- Navigation templates (2 members)
- Needs Audio Pronunciation (6,748 members)
- Needs Better Flag (4 members)
- Needs Description (Image) (48 members)
- Needs Etymology (297 members)
- Needs Image Description (111 members)
- Needs Pronunciation (6,764 members)
- Needs Resizing (331 members)
- Needs Source (Image) (40 members)
- Needs Source Verification (6 members)
- Needs Statistics (0 members)
- Needs Work (6,089 members)
- Needs Written Pronunciation (6,602 members)
- Needs flag (4 members)
- Negagender (1 member)
- Neogender (1 member)
- Neopronoun (2 members)
- Neopronoun Flag (3 members)
- Nequent Terms (8 members)
- Neuro (15 members)
- Neurogender (397 members)
- Neurogenders (1 member)
- NiN (0 members)
- Non-Conformity (37 members)
- Non-Monogamous (75 members)
- Nonbinary (17 members)
- Nonbinary Flag (7 members)
- Nonhuman (5 members)
- Not LGBTQ+ (4 members)
- Notice Template (2 members)
- Notice template (5 members)
- Notice templates (14 members)
- Noungender (207 members)
- Nounself Flag (3 members)
- Nuhoricrossic (8 members)
- Numbergender (1 member)
- OIN (1 member)
- OKIN (28 members)
- ORIN (5 members)
- OSIN (1 member)
- Objectgender (25 members)
- Omni (1 member)
- Omnine Genders (30 members)
- Orchidspec (11 members)
- Orientation (172 members)
- Orientation Flag (291 members)
- Orientation Flags (0 members)
- Orientation Prefix (13 members)
- Orientation System (3 members)
- Orientation Terminology (6 members)
- Orientationgender (28 members)
- Outherine (73 members)
- Ovisgender (1 member)
- Oxigender (5 members)
- Oxygender (1 member)