The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 1 mission videos (9 members)
- 3 mission videos (15 members)
- Achievements (4 members)
- Americans (51 members)
- Archæans (16 members)
- Argentineans (2 members)
- Article management templates (1 member)
- Articles needing citations (1 member)
- Assault Pack 1 (5 members)
- Assault Pack 2 (5 members)
- Assault Rifles (54 members)
- Athena Sword (14 members)
- Athena Sword Maps (17 members)
- Athena Sword Missions (11 members)
- Attachments (47 members)
- Attachments of Tom Clancy's Rainbow Six: Lockdown (4 members)
- Attachments of Tom Clancy's Rainbow Six: Shadow Vanguard (6 members)
- Attachments of Tom Clancy's Rainbow Six: Vegas (7 members)
- Attachments of Tom Clancy's Rainbow Six: Vegas 2 (7 members)
- Attachments of Tom Clancy's Rainbow Six 3: Black Arrow (3 members)
- Attachments of Tom Clancy's Rainbow Six 3: Raven Shield (4 members)
- Attachments of Tom Clancy's Rainbow Six 3 (Console) (2 members)
- Attachments of Tom Clancy's Rainbow Six Extraction (13 members)
- Attachments of Tom Clancy's Rainbow Six Mobile (32 members)
- Attachments of Tom Clancy's Rainbow Six Siege (14 members)
- Attacker (38 members)
- Aussies (3 members)
- Belarusians (2 members)
- Bio-Weapons (5 members)
- Black Arrow Maps (28 members)
- Black Thorn (13 members)
- Black Thorn Maps (15 members)
- Black Thorn Missions (10 members)
- BlogListingPage (3 members)
- Blog posts (69 members)
- Box Art (19 members)
- Brazilians (3 members)
- Brits (27 members)
- CC-BY-SA files (1 member)
- CC-BY files (10 members)
- CC-SA files (0 members)
- CGI Trailers (2 members)
- Candidates for Deletion (13 members)
- Cannucks (5 members)
- Character Images (28 members)
- Characters (48 members)
- Characters by Nationality (28 members)
- Characters of Rainbow Six (123 members)
- Characters of Rainbow Six (Film) (2 members)
- Characters of The End Begins: Rainbow Six (4 members)