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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Romanian words and phrases (1 member)
- Rooms (3 members)
- Root-finding algorithms (1 member)
- Root vegetables (19 members)
- Ropework (1 member)
- Rosacea (1 member)
- Rosaceae (6 members)
- Rosario (4 members)
- Roses (5 members)
- Rosoideae (1 member)
- Rotational symmetry (8 members)
- Rotavirus (5 members)
- Rotaviruses (2 members)
- Rotifers (5 members)
- Rotterdam (1 member)
- Rough translations (1 member)
- Roundworms (9 members)
- Rowing (1 member)
- Royal Agricultural College (1 member)
- Royal Air Force (2 members)
- Royal Army Medical Corps officers (3 members)
- Royal Canadian Mounted Police (1 member)
- Royal Caribbean International (2 members)
- Royal Colleges (5 members)
- Royal Navy (1 member)
- Royal Navy patrol boats (1 member)
- Royal New Zealand Navy (1 member)
- Royal Society (2 members)
- Royal Society of Chemistry (4 members)
- Royal Swedish Academy of Sciences (2 members)
- Rubber (2 members)
- Rubber properties (3 members)
- Rubiaceae (11 members)
- Rubidium (1 member)
- Rubidium compounds (6 members)
- Rubus (1 member)
- Rugs and carpets (1 member)
- Rules of inference (17 members)
- Rules of thumb (7 members)
- Running (2 members)
- Rural community development (3 members)
- Ruscaceae (2 members)
- Russian-Americans (1 member)
- Russian Nobel laureates (0 members)
- Russian and Soviet Germans (1 member)
- Russian beverages (1 member)
- Russian biochemists (0 members)
- Russian biologists (2 members)
- Russian culture (1 member)
- Russian educationists (0 members)