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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Purim foods (1 member)
- RADA Gold Medal winners (1 member)
- Radio personalities from Denver (1 member)
- Rail transport (4 members)
- Rail transport films (1 member)
- Rail transport in Sydney (4 members)
- Rail transport stations opened in 1862 (1 member)
- Railway lines closed in 2018 (1 member)
- Railway lines in Sydney (1 member)
- Railway lines opened in 1911 (1 member)
- Railway lines opened in 1998 (1 member)
- Railway lines opened in 2009 (1 member)
- Railway stations in Sydney (15 members)
- Railway stations opened in 1855 (1 member)
- Railway stations opened in 1878 (1 member)
- Railway stations opened in 1884 (1 member)
- Railway stations opened in 1886 (1 member)
- Railway stations opened in 1890 (2 members)
- Railway stations opened in 1893 (2 members)
- Railway stations opened in 1899 (1 member)
- Railway stations opened in 1906 (1 member)
- Railway stations opened in 1932 (2 members)
- Railway stations opened in 2009 (3 members)
- Railway stations opened in 2019 (8 members)
- Rare disease (2 members)
- Rare diseases (1 member)
- Reality (1 member)
- Recreation (1 member)
- References with ISBN code (1 member)
- Regional theatre in the United States (1 member)
- Religion (2 members)
- Religion and science (1 member)
- Religious organizations (1 member)
- Research (13 members)
- Research initiatives (1 member)
- Residents of Oak Park, Illinois (7 members)
- Resorts in Nevada (3 members)
- Retroviruses (1 member)
- Rheumatology (0 members)
- Road accident deaths in Texas (1 member)
- Rock and Roll Hall of Fame inductees (1 member)
- Rock music groups (1 member)
- Roman sword (1 member)
- Rotfrontkämpferbund members (1 member)
- Royal Conservatory of Brussels alumni (1 member)
- Royal Conservatory of Brussels faculty (1 member)
- Royal Netherlands Army (1 member)
- Russian Models (0 members)
- Russian actor (1 member)
- Russian entertainer (1 member)
- Russian female pianists (1 member)
- Russian model (1 member)
- Russian people by occupation (1 member)
- Schools in Alameda County, California (1 member)
- Science (4 members)
- Science and technology in the Netherlands (1 member)
- Scientific controversies (1 member)
- Scientific discipline (5 members)
- Scientists from Chicago (1 member)
- Scientists from Illinois (8 members)
- Screenplays by Billy Wilder (1 member)
- Screenplays by I. A. L. Diamond (1 member)
- Search for extraterrestrial intelligence (2 members)
- Second City alumni (1 member)
- Sexuality in Canada (0 members)
- Shakespeare festivals (1 member)
- Shumen (1 member)
- Siemens products (0 members)
- Skyscraper hotels in Nevada (2 members)
- Slot machines (1 member)
- Social Information Processing (0 members)
- Social media (3 members)
- Social networking services (0 members)
- Social science (1 member)
- Social sciences (1 member)
- Social security (1 member)
- Socialite American (1 member)
- Socialité American (1 member)
- Society (12 members)
- Sociology (1 member)
- Soft tissue disorder (1 member)
- Software (2 members)
- Soldier (1 member)
- Songs about Texas (1 member)
- Songs of the American Civil War (1 member)
- Songs with lyrics by Alfred Bryan (1 member)
- Songs written by Fred Fisher (1 member)
- Spanish Composers (1 member)
- Spanish golfer (1 member)
- Spanish lemma (1 member)
- Spirituality (1 member)
- Sport (3 members)
- Sports venues (1 member)
- Sportspeople (2 members)
- Sportspeople by nationality (2 members)
- Standard gauge railways (1 member)
- Strongman (2 members)
- Structure (1 member)
- Student newspapers published in California (1 member)
- Student organizations established in 1885 (1 member)