Tracklist
| 1 | O (Clean Radio Edit) | 3:59 |
| 2 | O (Instrumental) | 4:41 |
| 3 | O (Clean Album Version) | 4:41 |
| 4 | O (Callout Hook) | 0:15 |
Other versions
| Category | Artist | Title (Format) | Label | Category | Country | Year |
|---|---|---|---|---|---|---|
| OMARION 012 | Omarion | O (12", Single) | Sony Urban Music | OMARION 012 | UK | 2005 |
| 6759866 | Omarion | 'O' (12") | Sony BMG Music Entertainment | 6759866 | US | 2004 |
| 09976759865 | Omarion | O (12") | Sony Urban Music | 09976759865 | UK | 2005 |
| OMARIONODJ | Omarion | O (CD, Single, Promo) | Sony Urban Music | OMARIONODJ | UK | 2005 |
| OMARIONOCD1 | Omarion | O (CD, Single, Promo) | Sony Urban Music | OMARIONOCD1 | UK | 2005 |
