The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 1-2-3 Transformers (1 member)
- 1-2-3 Transformers characters (5 members)
- 2019 chat logs (7 members)
- 2020 chat logs (11 members)
- 2024 films (1 member)
- 2nd-in-Commands (10 members)
- 3D Battle-Cards (11 members)
- 3H (12 members)
- 3H issues (17 members)
- 707.04 Delta Characters (2 members)
- 707.04 Delta Mecha (2 members)
- 785.06 Alpha Characters (2 members)
- A - Z (1 member)
- Abilities (7 members)
- Action Force (13 members)
- Action Master images (1 member)
- Action Master partners (16 members)
- Action Master toy images (1 member)
- Action Masters (74 members)
- Activator Mini-Cons (8 members)
- Activision (6 members)
- Activity books (5 members)
- Actor images (14 members)
- Actors (13 members)
- Adaptations (18 members)
- Administration of this site (1 member)
- Aerialbots (32 members)
- Affiliations (22 members)
- Africa (4 members)
- Age of Extinction (24 members)
- Age of Extinction Autobots (21 members)
- Age of Extinction Decepticons (10 members)
- Age of Extinction Humans (10 members)
- Age of Extinction Robots in Disguise toy images (1 member)
- Age of Extinction Transformers (2 members)
- Age of Extinction characters (3 members)
- Age of Extinction images (2 members)
- Age of Extinction locations (5 members)
- Age of Extinction media (3 members)
- Age of Extinction screen captures (1 member)
- Age of Extinction subgroups (2 members)
- Age of Extinction technology (1 member)
- Age of Extinction toy images (2 members)
- Age of Extinction toy stock images (1 member)
- Airachnid images (5 members)
- Aircraft (6 members)
- Album covers (1 member)
- Albums (8 members)
- Alchemor Inmates (41 members)
- Alien humans (1 member)