The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- United Empire of Earth Military Characters (1 member)
- United Empire of Earth Navy (1 member)
- United Planets of Earth Characters (2 members)
- United Planets of Earth Faction Characters (2 members)
- Universal Body Armor (2 members)
- Universalists (16 members)
- Universities (26 members)
- Unknown (6 members)
- Unknown Characters (2 members)
- Unknown Copyright Images (10 members)
- Unknown Size ships (0 members)
- Unknown Systems (3 members)
- Unknown amor type (1 member)
- Unknown class (3 members)
- Unknown commodities (8 members)
- Unknown consumables (2 members)
- Unknown grade (11 members)
- Unknown manufacturer (24 members)
- Unknown missile racks type (19 members)
- Unknown rocket pods type (9 members)
- Unknown type apparel (6 members)
- Untracked Missions (1 member)
- Unused modules (3 members)
- Upcoming Patches (12 members)
- Upsiders (2 members)
- Ursa images (30 members)
- Ursa series (2 members)
- User Images (3 members)
- Userpage templates (1 member)
- Users (1 member)
- Utility attachments (5 members)
- Utility templates (18 members)
- VFG Industrial (1 member)
- VK00 (1 member)
- Vagabond System (1 member)
- Valkyrie Images (78 members)
- Valkyrie series (0 members)
- Valor Sentry Mine images (1 member)
- Vanduul (3 members)
- Vanduul Characters (13 members)
- Vanduul Clans (27 members)
- Vanduul Faction Characters (12 members)
- Vanduul Systems (16 members)
- Vanguard Harbinger Images (29 members)
- Vanguard HopLite Images (1 member)
- Vanguard Hoplite images (13 members)
- Vanguard Images (1 member)
- Vanguard Sentinel Images (30 members)
- Vanguard System (1 member)
- Vanguard Warden Images (67 members)