{{Wikipedia:Unsuccessful adminship candidacies/header}}
- O Keyes, 4 December 2007 - closed per WP:SNOW by Sasha Callahan at (1/8/0)
- :O Keyes 2, 19 March 2008 - closed per WP:SNOW by Camaeron at (0/8/2)
- Oanabay04, 24 January 2014 - closed per WP:SNOW by Trevj at (5/20/10)
- Obaidz96, 24 March 2008 - withdrawn by candidate at (1/5/0)
- Oddmartian, 19 September 2006 - withdrawn by candidate at (0/7/0)
- :Oddmartian, 9 September 2007 - closed per WP:SNOW by Melsaran at (0/7/0)
- Onel5969, 5 January 2017, withdrawn by candidate at (81/27/5)
- One Salient Oversight, 30 March 2005 - consensus not reached (6/4/2)
- Ohnoitsjamie, 28 January 2006 - consensus not reached (14/10/5)
- :Ohnoitsjamie, 29 June 2006 - promoted (96/0/0)
- OhanaUnited, 7 November 2007 - consensus not reached (51/21/7)
- : OhanaUnited, 19 February 2008 - promoted (79/0/0)
- Oliver202, 16 September 2006 - withdrawn by candidate (0/0/0)
- :Oliver202, 22 Februrary 2007- withdrawn by candidate (3/8/0)
- oliver3669, 7 December 2007 - closed per WP:SNOW by EVula at (1/7/1)
- Ohmpandya, 1 January 2008 - withdrawn by candidate at (11/28/4)
- Ohmpandya, 14 January 2008 - closed by bureaucrat WJBscribe at (3/7/7)
- Olz06, 6 January 2008 - closed in accordance with WP:SNOW by admin Acalamari (0/9/0)
- Ombudsman, 31 October 2006 - closed by bureaucrat Taxman at (6/25/8)
- oo7565, 8 June 2007 - withdrawn by candidate at (0/8/0)
- oo7565, 7 November 2007 - closed per WP:SNOW by Qst at (0/7/0)
- Osarius, 28 February 2010, - closed as unsuccessful by bureaucrat Rlevse at (15/33/8)
- Osbus, 4 June 2006, - closed by bureaucrat Nichalp at (9/27/5)
- Oscarthecat, 25 March 2006 - consensus not reached (33/15/5)
- :Oscarthecat, 10 September 2006 - promoted at (56/5/4)
- Oshwah, 16 September 2015 - withdrawn by candidate (28/19/5)
- :Oshwah, 29 August 2016 - promoted at (189/63/20)
- Otherlleft, 8 February 2010 - consensus not reached (44/17/8)
- Ottava Rima, 7 April 2009 - not successful (61/107/17)
- Otto4711, 17 May 2007 - closed by admin Dgies at (1/21/4)
- OverlordQ, 23 February 2008 - consensus not reached (29/20/4)
- :OverlordQ, 20 March 2009 - promoted (72/15/4)
- Owainbut, 5 May 2006 - withdrawn by candidate at (0/3/0)
- Owie123, 5 March 2007 - closed by admin Rje at (0/4/2)
- Ozgod, 4 June 2007 - consensus not reached (20/11/8)
- Ozzaroni, 7 March 2008 - closed in accordance with WP:SNOW by Wisdom89 at (0/3/0)
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