| Artist | Title | Episode | Scene | CD |
| Onephatdeeva (feat. Lisa Millett) | Bad Habits | 203 | Michael confronts Brian (Babylon) | x |
| OnePhatDeeva featuring Lisa Millett | Bad Habit (ATFC - Global Groove Mask Mix) | 203 | Michael confronts Brian (Babylon) | x |
| Operatica "O" | Melancholy Rose | 120 | Babylon - Dr. Dave surrounded / Justin plans | x |
| Orang'e | The Music (Razor n Guido Club Mix) | 103 | Brian steps into crowd | x |
| Organic Audio | Good To Go | 406 | Brian and Justin @ Gym | x |
| Origene | Sancturary (Harry Lemon Remix) | 410 | Babylon - Brian Finds Justin | Queer As Folk: The Fourth Season |
| Orlando Careca vs. the Cosmonut | I'm A Sex Machine | 213 | Justin looks for a new job | x |