Bands
Occulsed
Death Metal · Atlanta, GA
Oceans of Slumber
Progressive Metal/Rock · Houston, TX
October Noir
Gothic/Doom Metal · Pensacola, FL
Oculus of Profanations
Death Metal · Del Rio, TX
Of Forsaken Divinity
Experimental Ambient Black Metal · Weslaco, TX
Of the Fallen
Melodic Deathcore/Death Metal · Houston, TX
Oh, the Depth
Symphonic Deathcore · Houston, TX
Omega Tribe
Thrash/Groove Metal · Bristol, TN
Omen of Death
Black Metal/Ambient · Conroe, TX
OmenBringer
Stoner Metal/Rock · Nashville, TN
Omission
Thrash Metal/Crossover · Dallas, TX
Omnimorph
Post-Metal · Denton, TX
OmniTerror
Death Metal · Fort Worth, TX
Omotai
Progressive Sludge Metal · Houston, TX
On Neginoth
Black Metal, Ambient · Nashville, TN
One We Created
Technical Death Metal/Deathcore · San Antonio, TX
Open Kasket
Death Metal/Hardcore · Little Rock, AR
Opium
Death Metal / Grindcore · Tupelo, MS
Orangutan Juice
Sludge/Stoner/Doom Metal · Corpus Christi, TX
Orcanaut
Progressive Stoner/Sludge Metal · Denton, TX
Order of Bileth
Black Metal · Mission, TX
Order of the Owl
Sludge/Stoner Metal · Atlanta, GA
Order of Týr
Symphonic Power Metal with Electronic influences · Memphis, TN
Ordre Wampyrica
Raw Black Metal · Memphis, TN
Organ
Thrash Metal/Grindcore · Atlanta, GA
Orphan Crippler
Blackened Death Metal · Fayetteville, AR
Orthodox Fuzz
Southern/Stoner Metal/Rock · Fort Worth, TX
Ostrov
Atmospheric Sludge Metal / Post-Hardcore · Hattiesburg, MS
Otherwise Dead
Metalcore/Groove Metal · Plano, TX
Otis Reaper
Sludge Metal · Jackson, TN
Oubliette
Melodic Black Metal · Murfreesboro, TN
Outlaw Order
Sludge Metal · New Orleans, LA
Outlook Grim
Heavy/Groove Metal · Knoxville, TN
Outpost 31
Crossover/Thrash Metal · Houston, TX
Oven
Stoner/Doom Metal · Bristol, TN
Overt Enemy
Thrash Metal · Mission, TX
Ovnev
Atmospheric Black Metal · Spring, TX
Ox Combine
Thrash Metal · Fort Worth, TX
Oxxen
Stoner/Sludge Metal · Chattanooga, TN
Ozark Shaman
Black/Thrash Metal · Little Rock, AR
P.L.F.
Grindcore · Houston, TX
Paegan
Death Metal · Seguin, TX
Pagan Invader
Doom Metal/Hard Rock · Chattanooga, TN
Pains Chapel
Heavy Metal · Chattanooga, TN
Palace of the Fallen
Death Metal/Hardcore · Atlanta, GA
Paladin
Power/Thrash Metal · Atlanta, GA
Palantir
Black Metal · Fayetteville, AR
Pale Misery
Black / Sludge Metal / Crust Punk · Lafayette, LA