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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Origin hypotheses of ethnic groups (1 member)
- Origin of life (16 members)
- Original Wikipedian userboxes (1 member)
- Orion arm (1 member)
- Oripavines (2 members)
- Orlando, Florida (5 members)
- Ormskirk (1 member)
- Ornamental plants (6 members)
- Ornamental trees (4 members)
- Ornaments (1 member)
- Ornithogalum (1 member)
- Ornithology (2 members)
- Orobanchaceae (1 member)
- Orphan drugs (16 members)
- Orphan initialisms (1 member)
- Orphaned articles (8 members)
- Orphaned articles from April 2007 (9 members)
- Orphaned articles from April 2014 (2 members)
- Orphaned articles from April 2016 (1 member)
- Orphaned articles from April 2017 (1 member)
- Orphaned articles from April 2018 (1 member)
- Orphaned articles from August 2006 (69 members)
- Orphaned articles from August 2007 (18 members)
- Orphaned articles from August 2015 (1 member)
- Orphaned articles from August 2017 (2 members)
- Orphaned articles from August 2018 (5 members)
- Orphaned articles from December 2006 (8 members)
- Orphaned articles from December 2007 (17 members)
- Orphaned articles from December 2017 (3 members)
- Orphaned articles from December 2018 (5 members)
- Orphaned articles from February 2007 (12 members)
- Orphaned articles from February 2008 (1 member)
- Orphaned articles from February 2009 (1 member)
- Orphaned articles from February 2017 (1 member)
- Orphaned articles from February 2018 (4 members)
- Orphaned articles from January 2007 (17 members)
- Orphaned articles from January 2008 (6 members)
- Orphaned articles from January 2018 (4 members)
- Orphaned articles from January 2019 (37 members)
- Orphaned articles from July 2006 (99 members)
- Orphaned articles from July 2007 (10 members)
- Orphaned articles from July 2018 (2 members)
- Orphaned articles from June 2006 (1 member)
- Orphaned articles from June 2007 (14 members)
- Orphaned articles from June 2018 (5 members)
- Orphaned articles from March 2007 (17 members)
- Orphaned articles from March 2010 (1 member)
- Orphaned articles from March 2017 (1 member)
- Orphaned articles from March 2018 (16 members)
- Orphaned articles from May 2007 (15 members)