Your query returned 213 metal bands starting with the letter O.
| Band | Formed | Country |
|---|---|---|
| O | ||
| O, Majestic Winter | 2008 | United States |
| O.M.T | United Kingdom | |
| Oak and Bone | United States | |
| Oakhelm | United States | |
| Oath To Vanquish | Lebanon | |
| Oathean | 1997 | Korea, South |
| Obispo Fornicado | Spain | |
| Obituary | 1984 | United States |
| Oblige | United States | |
| Oblique Rain | 2004 | Portugal |
| Obliterate | 1992 | Slovakia |
| Obliteration | Norway | |
| Obliterhate | 2006 | Singapore |
| Obscene Gesture | United States | |
| Obscenity | Germany | |
| Obscura | 2002 | Germany |
| Obscurant | 2000 | Finland |
| Obscure | Norway | |
| Obscured | 2003 | Serbia |
| Obsessed | 1998 | Germany |
| Obsidian | 1997 | Netherlands |
| Obtest | Lithuania | |
| Occult | 1990 | Netherlands |
| Occvlta | Germany | |
| Ocean | ||
| Oceano | 2006 | United States |
| Oceans of Sadness | 1995 | Belgium |
| Oceans of Time | ||
| Octagon | ||
| Octane Gypsy | United States | |
| Octavia | 2000 | Norway |
| Octavia Sperati | 2000 | Norway |
| October File | United Kingdom | |
| Odd Zero | ||
| Oddzar | United States | |
| Odenwrath | Sweden | |
| Odhinn | 1995 | Sweden |
| Odin's Court | ||
| Odious Mortem | 2000 | United States |
| Odious Sanction | 1994 | United States |
| Odium | Canada | |
| Odroerir | Germany | |
| Odum | United States | |
| Odyssea | 1999 | Italy |
| Odyssey | United States | |
| Of Hearts and Shadows | 2003 | United States |
| Of Infinity | 1999 | United States |
| Of Machines | United States | |
| Of Raven & Ruins | 2005 | United States |
| Of Reality Beyond | Canada | |
| Of the Archaengel | Brazil | |
| Of The First Born Son | Canada | |
| Of The Gods | 2004 | United States |
| Of Withering Ashes | 2003 | Norway |
| Office of Strategic Influence | 2002 | United States |
| Officium Triste | 1994 | Netherlands |
| Oh, Sleeper | United States | |
| Ohm | ||
| Oktor | 2003 | Poland |
| Old Corpse Road | 2007 | United Kingdom |
| Old Forest | ||
| Old Man Gloom | ||
| Old Man's Child | 1989 | Norway |
| Olm | ||
| Olympos Mons | 2002 | Finland |
| Om | 2003 | United States |
| Omega Crom | 2002 | Canada |
| Omega Flare | ||
| Omega Lithium | Croatia | |
| Omen | ||
| Ominous | 2001 | United States |
| Ominous Grief | 1998 | Turkey |
| Ominous Sky | ||
| Omission | Spain | |
| Omnia | United States | |
| Omnium Gatherum | 1996 | Finland |
| Omophagia | Switzerland | |
| On | Spain | |
| On A Pale Horse | United States | |
| On A Warpath | ||
| On Broken Wings | 2001 | United States |
| On Our Own | ||
| On Paths of Torment | ||
| On The Outside | ||
| On Thin Ice | ||
| Once Beloved | ||
| Once Dead | United States | |
| Once For All | ||
| Once Forgotten | United States | |
| Once Nothing | United States | |
| One Day As A Lion | 2008 | United States |
| One Dead Three Wounded | United States | |
| One Hour Hell | Sweden | |
| One Life Crew | United States | |
| One Man Army | ||
| One Man Army and the Undead Quartet | 2004 | Sweden |
| One Minute Silence | United Kingdom | |
| One Without | Sweden | |
| Onesidezero | United States | |
| Onheil | 1999 | Netherlands |
| Onicectomy | Italy | |
| Only Crime | ||
| Only Living Witness | United States | |
| Onsetcold | ||
| Onslaught | 1982 | United Kingdom |
| Onus | 1998 | United States |
| Onward | United States | |
| Onward To Olympas | 2008 | United States |
| Oomph! | Germany | |
| Open Hand | 1999 | United States |
| Opera IX | 1988 | Italy |
| Operatika | 2002 | United States |
| Operation Winter Mist | 1998 | Canada |
| Operator | ||
| Operator Dead:Post Abandoned | United States | |
| Opeth | 1990 | Sweden |
| Ophiolatry | Brazil | |
| Ophis | 2000 | Germany |
| Opiate for the Masses | 1999 | United States |
| Opius | United States | |
| Opposite Sides | Italy | |
| Opposition of One | ||
| Opposition Party | Malaysia | |
| Oppression | ||
| Opprobrium | ||
| Optimal Impact | 1998 | Canada |
| Opus Dai | United States | |
| Oracle Of The Void | Australia | |
| Orakle | 1994 | France |
| Orange Goblin | United Kingdom | |
| Orange Sky | Trinidad and Tobago | |
| Orangeburg Massacre | 2004 | United States |
| Oranssi Pazuzu | Finland | |
| Orb Of Torture | 2002 | Belgium |
| Orbiter | Serbia | |
| Orchidectomy | 2004 | Canada |
| Orcrist | 2000 | Italy |
| Orcus | 2003 | United States |
| Orcustus | 2002 | Norway |
| Orden Ogan | 1996 | Germany |
| Order Of Ennead | 2007 | United States |
| Order of Nine | 2001 | United States |
| Order Of The Unnead | ||
| Order Of Unnead | ||
| Ordo Draconis | Netherlands | |
| Ordo Tyrannis | ||
| Ordog | 2005 | Finland |
| Organ | United States | |
| Origin | 1997 | United States |
| Original Pranksta | ||
| Ork | Bulgaria | |
| Orodruin | ||
| Orphan Project | 2001 | United States |
| Orphanage | Netherlands | |
| Orphaned Land | 1991 | Israel |
| Orthrelm | 2000 | United States |
| Orthrus | ||
| Osbscene Eulogy | ||
| Osidious | United States | |
| Oskorei | 2003 | United States |
| Osmium | ||
| Ossein | 2006 | United States |
| Ossification | United States | |
| Otep | 2000 | United States |
| Oubliette | ||
| Our Darkest Day | United States | |
| Our Father | Canada | |
| Our Final Chapter | United States | |
| Our Last Night | 2004 | United States |
| Ouroboros | Australia | |
| Ourselves | ||
| Out For Blood | 2003 | United Kingdom |
| Out To Win | United States | |
| Outbreak | United States | |
| Outburst | 1998 | Netherlands |
| Outcry Collective | United Kingdom | |
| Outlast | Sweden | |
| Outlaw Order | United States | |
| Outloud | ||
| Outrage | ||
| Outrageous Rhinoceros | United States | |
| Outworld | United States | |
| Ov Hell | 2009 | Norway |
| Over My Dead Body | ||
| Over The Coals | ||
| Overcast | 1991 | United States |
| Overdawn | ||
| Overdrawn | ||
| Overdrive | 1980 | Sweden |
| Overhead | Finland | |
| Overkill | United States | |
| Overlorde | 1985 | United States |
| Overmars | 2001 | France |
| Overscene | United States | |
| Owen Hart | ||
| Own Worst Enemy | ||
| Oxbow | United States | |
| OxZide | ||
| Ozzy Osbourne | United Kingdom | |
| The Oath | 1999 | France |
| The Ocean | 2000 | Germany |
| The Ocularis Infernum | Australia | |
| The Old Dead Tree | France | |
| The Omega Experiment | ||
| The Omen | Australia | |
| The Orange Man Theory | ||
| The Orangeburg Massacre | 2004 | United States |
| The Orchid's Curse | 2005 | Canada |
| The Order Of Apollyon | United Kingdom | |
| The Ordher | Brazil | |
| The Other Side Of The Sky | ||
| The Ottoman Empire | 2006 | United States |
