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
Off Punk Плевен 1999
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/AOR Шумен 2012
Outrage Hardcore Варна 1996
Outsider Thrash Metal Ямбол 1990
Overdawn Metalcore/Deathcore Русе 2002
OverGame Progressive Metal София 2008