- One (ITA) (Black Metal-Italy)
- One (FRA) (Heavy Metal-France)
- One 30 Edge (Nu Metal-USA)
- One Against The Grain (Progressive Metal-USA)
- One Arm Away (Thrash Heavy-Brazil)
- One Bad Apple (Crossover-USA)
- One Bad Pig (Crossover-USA)
- One Blind Came (Death Metal-Colombia) - Other name : OBC
- One Brick Down (Hardcore-USA) - Other name : OBD
- One Bullet Left (NL) (Thrash Death-Netherlands) - Other name : OBL
- One Bullet Left (GER) (Deathcore-Germany) - Other name : OBL
- One Bullet Resolution (Alternative Metal-Canada)
- One Burning Match (Noise Hardcore-France)
- One Choice (Hardcore-USA)
- One Day As A Lion (Fusion-USA) - Other name : ODAAL
- One Day Before (Cyber Metal-Russia)
- One Day In Fukushima (Grindcore-Italy)
- One Day Waiting (Alternative Metal-USA) - Other name : ODW
- One Dead Dream (Crossover-Australia)
- One Dead Three Wounded (Metalcore-USA) - Other name : ODTW
- One Desire (Hard Rock-Finland)
- One Dollar Death (Death Metal-USA)
- One Down (Hardcore-United-Kingdom)
- 180 Proof (Hard Rock-Australia) - Other name : One Eighty Proof
- One Eyed Monster (Thrash Metal-Spain)
- Abwhore (Gothic Black-USA) - Other name : ex-One Flesh
- One For Sorrow (Hardcore-Belgium)
- One Hate (Hardcore-France) - Other name : The One Hate
- One Hell Of A Christmas (Heavy Metal-Denmark)
- One Hit Wonders (Alternative Metal-Chile) - Other name : OHW!
- One Hour (Metalcore-Belgium)
- One Hour Hell (Death Metal-Sweden)
- One Hundred Thousand (Nu Metal-USA)
- One I Cinema (Alternative Metal-Germany)
- One Inch Giant (Stoner-Sweden) - Other name : OIG
- One King Down (Hardcore-USA)
- One Last Breath (Post Hardcore-USA) - Other name : OLB
- One Last Chance (Hardcore-Switzerland) - Other name : OLC
- One Last Hero (Electro Metal-Germany) - Other name : OLH
- One Last Legacy (Heavy Metal-Germany) - Other name : OLL
- One Last Look (Electro Metal-USA) - Other name : OLL
- One Last Run (Hard Rock-United-Kingdom)
- One Last Shot (Stoner-France)
- One Last Sin (Deathcore-USA)
- One Last Soul (Hardcore-USA)
- One Last Word (Death Metal-Spain)
- One Leg Man (Metal-Italy)
- One Less Reason (Alternative Metal-USA) - Other name : OLR
- One Life All-In (Hardcore-Other)
- One Life Crew (Hardcore-USA)
- One Machine (Thrash Metal-United-Kingdom) - Other name : ex-Firehead
- One Man Army And The Undead Quartet (Death Thrash-Sweden) - Other name : OMAATUQ
- One Man Terror (Metal-France) - Other name : OMT
- One Man's Hell (Death Metal-Chile)
- One Master (Black Metal-USA)
- Glass Casino (Heavy Rock-Portugal) - Other name : ex-One Meter Fall, ex-The Systemize, ex-Golden Dragons
- One Mind Ministry (Thrash Black-Germany)
- One Minute Halo (Alternative Metal-USA) - Other name : OMH
- One Minute Shy (Thrash Heavy-Canada)
- One Minute Silence (Nu Metal-United-Kingdom) - Other name : OMS, ex-Near Death Experience
- One More Lie (Melodic Death-Turkey)
- One More Page (Heavy Metal-Turkey) - Other name : OMP
- One More Victim (UK) (Hardcore-United-Kingdom) - Other name : OMV
- One More Victim (RUS) (Deathcore-Russia) - Other name : OMV
- One Morning Left (Electro Metal-Finland) - Other name : OML
- One Night Actress (Metalcore-Russia)
- ONATRA (Symphonic Metal-Ukraine) - Other name : One Night At The River Arcanum
- One Night Stand (Hard Rock-France) - Other name : ONS
- One Of Nine (Black Metal-USA)
- One Of Sixx (Power Metal-USA)
- One Of Them (Thrash Metal-Brazil)
- One Of These Days (Grindcore-Greece)
- One Of Us (Dark Metal-Mexico)
- One On One (NL) (Thrash Metal-Netherlands)
- One On One (USA) (Hardcore-USA)
- One Orphan More (Melodic Metal-Finland) - Other name : OOM
- One Out Of Hell (Thrash Heavy-Slovenia)
- One Outs (Grindcore-New-Zealand)
- One Past Zero (Stoner-Germany)
- One Per Coffin (Grindcore-USA)
- One Piece Puzzle (Industrial Metal-Croatia) - Other name : OPP
- One Pound Flesh From Your Chest (Deathcore-Austria)
- One Reason To Kiss (Melodic Death-Hungary)
- One Rise Ion (Metalcore-Ukraine)
- One Second Thought (Hardcore-USA)
- One Sense Too Much (Deathcore-Other)
- One Shot For All (Deathcore-Russia) - Other name : OSFA
- 1 Shot Kill (Death Metal-Australia) - Other name : One Shot Kill
- One Shot Thrill (Electro Metal-USA) - Other name : OST
- One Size Fits All (Metalcore-France) - Other name : OSFA
- One Solution Only (Melodic Death-USA)
- One Soul (Crossover-Germany)
- One Star (Visual Kei-Japan) - Other name : ??????
- One Starving Day (Hardcore-Italy) - Other name : OSD
- One Step Ahead (Hardcore-Germany)
- One Step At A Time (Hardcore-Belgium)
- One Step Beyond (AUS) (Alternativ Death-Australia) - Other name : OSB
- One Step Beyond (BEL) (Hardcore-Belgium)
- One Step Closer (Hardcore-USA)
- One Step From The Edge (Technical Thrash-Greece)
- One Step Out (Industrial Metal-France)
- One Step To Kill (Deathcore-Ukraine) - Other name : OSTK
- One Tail, One Head (Black Metal-Norway)
- Sakred Plague (Industrial Metal-France) - Other name : SKP, ex-One True Sakred
- One Vital Word (Hardcore-Australia) - Other name : OVW
- One Vote For Violence (Deathcore-USA) - Other name : OVFV
- One We Created (Technical Death-USA)
- One Will Fall (Deathcore-USA)
- One With The Riverbed (Atmospheric Black-USA)
- One Without (Gothic Metal-Sweden)
- One Year Later (Metalcore-USA) - Other name : OYL
- One-Way Mirror (Alternative Metal-France) - Other name : OWM
- One's Own Blood (Metalcore-USA) - Other name : OOB
- Onedice (Deathcore-United-Kingdom)
- OneFromTheNorth (Industrial Metal-Finland)
- OneGodLess (Stoner-Netherlands) - Other name : ex-Mourn
- Oneheadedman (Metal-Hungary)
- Oneiric (Progressive Metal-Poland) - Other name : ex-Open Mind
- Oneiric Eclipse (Black Metal-USA)
- Oneiros (Dark Metal-Germany) - Other name : ex-Slaves Of Cruelty
- Oneitis (Metal-France)
- Onesidezero (Grunge-USA)
- Onesta (Hardcore-France)
- Onethium (Black Metal-USA)
- Onetwotwo (Crossover-France) - Other name : 122
- Oney (Hard Rock-USA)
- Oneyed Jack (Fusion-France)