O

O.H. Thrash Metal/Hardcore Видин/София 2001
O.K. Girls! Sleaze Rock/Glam Rock София/Германия 1989
Obsidian Sea Doom Metal София 2009
Occultum Black Metal София 2011
Oceanwide Alternative Rock София 2015
Odd Crew Groove Metal/Metalcore София 2008
Odium Death Metal Плевен 1992
Offroad Heavy Metal София 2006
Ogi 23 Punk Rock/Ska София 2005
OJ Band Classic Rock/Country Rock София 2002
Old Joe's Anger Hardcore/Punk Ловеч 2004
Omerta Hardcore Punk София 2005
On Our Own Metalcore/Hardcore Варна 2006
On Wings Doom Metal София 1994
One Faith Hardcore Варна 2001
Ophan Experimental Math Metal София 2006
Ophidian Clasp Metalcore/Deathcore Перник 2015
Order Of Splendour Black/Death Metal Плевен 1998
Orenda Black Metal Враца 2004
Ork Black Metal Дупница 1995
Out of Tune Hard Rock Шумен 2012
Outrage Hardcore Варна 1996
Outsider Thrash Metal Ямбол 1990
Overdawn Metalcore/Deathcore Русе 2002
OverGame Progressive Metal София 2008