| Artist | Album | Record Label | Released | Added To List | |
| Real Life | Oblivion | A Different Drum | 2004 | 1/1/2005 | Request |
| Obscure Descension | Obscure Descension | Atrocity Records | 2009 | 10/18/2009 | Request |
| Andraculoid | Observations In Human Error | DSBP Records | 2000 | 1/1/2005 | Request |
| backandtotheleft | Obsolete | 23DB | 2004 | 5/11/2005 | Request |
| Rachel Stamp | Oceans of Venus | Captiva Records | 2003 | 1/1/2005 | Request |
| Fischerspooner | Odyssey | Capitol Records | 2005 | 5/7/2005 | Request |
| VNV Nation | Of Faith, Power and Glory | Anachron Sounds | June 19, 2009 | 1/2/2010 | Request |
| Pride and Fall | Of Lust and Desire | Metropolis Records | 2013 | 8/10/2014 | Request |
| Ohm | Ohm | Artoffact Records | 2013 | 8/10/2014 | Request |
| Symbiont | Ology | DSBP Records | 2002 | 1/1/2005 | Request |
| Terminal Choice | Ominous Future | Interbeat Records | 2000 | 1/1/2005 | Request |
| Scanalyzer | On The One And The Zero | Positron! Records | 2006 | 1/30/2006 | Request |
| I, Parasite | On This Cold Floor | Dark Vision Media | 2003 | 1/1/2005 | Request |
| Bigod20 | One | Zoth Ommog | 1994 | 1/1/2005 | Request |
| Bounte | One | Positron! Records | 2007 | 4/8/2007 | Request |
| Mesh | Only Better | Metropolis Records | October 6, 2009 | 1/3/2010 | Request |
| Empty | Open Aeon | Aphotic Audio | 2006 | 3/7/2007 | Request |
| Ganymede | Operation Ganymede | Cohaagen Music | 2008 | 9/28/2008 | Request |
| Hypnoskull | Operation Tough Guy | Ant-Zen | 2003 | 1/1/2005 | Request |
| Stochastic Theory | Opposite Extremes | Sonic Mainline | 2006 | 8/27/2007 | Request |
| i:scintilla | Optics | Alfa Matrix | 2007 | 8/14/2007 | Request |
| Wideband Network | Orbit | A Different Drum | 2003 | 2/11/2007 | Request |
| Genetic Selection | Orbital Ground Attack | Ant-Zen | 2004 | 1/1/2005 | Request |
| oRdnance | Ordnance | (None) | 2011 | 8/7/2011 | Request |
| Akron | Origins of the 7 Deadly Sins | Hypervoxx Recordings | 2007 | 1/29/2007 | Request |