Sik

Stoner/Groove Metal

Dallas, Texas

Active

Sik Mentality

Thrash Metal/Crossover

Houston, Texas

Unknown

Silence the Messenger

Melodic Death Metal/Metalcore (early); Deathcore (later)

San Antonio, Texas

Split-up

Silent Deep Ocean

Doom/Gothic Metal

Venus, Texas

Active

Silent Holocaust

Thrash Metal/Metalcore

Denton, Texas

Split-up

Silvertonguedevil

Thrash Metal

Dallas, Texas

Active

Since My Beloved

Metalcore

Fort Worth, Texas

Split-up

Sindican

Thrash Metal

Fort Worth, Texas

Changed name

Sinful Serenade

Melodic Thrash/Heavy Metal

Brownfield, Texas

Active

Sinira

Melodic Black Metal

Nacogdoches, Texas

Split-up

Sinister Minister

Thrash/Death Metal

Conroe, Texas

Active

Sinistra

Progressive Metal/Metalcore

Austin, Texas

Active

Sinner's Row

Heavy/Thrash Metal

Houston, Texas

Active

Sintegrity

Death Metal

Corpus Christi, Texas

Split-up

Sinthgunt

Black Metal

Texas

Unknown

Sintury

Brutal Death Metal

Cedar Hill, Texas

Split-up

Sinworm

Brutal Death Metal/Grindcore

Texas (early); Indiana (later)

Active

Siphoned Life

Progressive Death Metal

Dallas, Texas

Active

Sitri

Melodic Death Metal/Metalcore

Austin, Texas

On hold

Six Minute Century

Progressive Metal

Houston, Texas

Split-up

Six Pound Skin Suit

Progressive Death Metal/Metalcore

Austin, Texas

Active

Sixkiller

Heavy Metal/Hard Rock

Irving, Texas

Split-up

Sixpasthell

Groove Metal

Houston, Texas

Split-up

Skalp

Death Metal/Grindcore

San Antonio, Texas

Active

Skeletal Monolith

Grindcore/Goregrind

Houston, Texas

Active

Skeleton

Hardcore Punk (early); Black/Death/Thrash Metal (later)

Austin, Texas

Active

Skelteria

Thrash Metal

Dallas/Fort Worth, Texas

Split-up

Skeptic

Death Metal

Houston, Texas

Unknown

Skincrawler

Death/Black Metal with Punk influences

Texas (early); San Diego, California (later)

Unknown

Skinpeeler

Sludge/Death Metal/Hardcore

San Antonio, Texas

Active