The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Ocean Planet (10 members)
- Octagon (4 members)
- Odin (1 member)
- Odin III images (3 members)
- Odin System (8 members)
- Odin system (2 members)
- Odyssey Flight Suit Images (3 members)
- Odyssey II Helmet images (2 members)
- Odyssey II images (1 member)
- Odyssey II set (1 member)
- Odyssey images (24 members)
- Offices (1 member)
- Old 38 Bar images (1 member)
- Olympus Principal images (1 member)
- Omarof (16x Telescopic) images (1 member)
- Omnisky XII Laser Autocannon images (1 member)
- Omnisky images (2 members)
- On Aberdeen (5 members)
- On Angeli (1 member)
- On ArcCorp (planet) (1 member)
- On Aremis (1 member)
- On Arial (2 members)
- On Armitage (planet) (1 member)
- On Ashana (1 member)
- On Asura (1 member)
- On Baker IV (1 member)
- On Borea (2 members)
- On Branaugh II (1 member)
- On Calliope (11 members)
- On Carteyna (1 member)
- On Cascom (1 member)
- On Cassel (2 members)
- On Cellin (14 members)
- On Cestulus (1 member)
- On Clio (4 members)
- On Cole (1 member)
- On Crusader (1 member)
- On Daymar (20 members)
- On Delamar (1 member)
- On Earth (3 members)
- On Euterpe (3 members)
- On Green (1 member)
- On Hurston (29 members)
- On Hyperion (1 member)
- On Ita (2 members)
- On Jalan (1 member)
- On Kampos (1 member)
- On Keene (1 member)
- On Lago (1 member)
- On Lo (1 member)