Spaz Attack is a heavy and power metal band from Boston, Massachusetts, formed in 2017, delivering the high-energy riff-driven approach of classic American heavy metal with the melodic sensibility of the power metal tradition.

Spectra is a heavy metal band from Rubidoux, California, formed in 2016, working within the traditional heavy metal style with an emphasis on melodic songwriting and classic genre sensibilities. Their sound reflects the enduring influence of the NWOBHM and American power metal traditions.

Spectral Damnation is a progressive heavy and power metal band from Kingston, New York, formed in 2018, blending the epic melodic ambition of power metal with progressive metal's structural complexity. Their music favors expansive arrangements, technical proficiency, and soaring vocal dynamics.

Spectral Outrider is a New York blackened heavy metal band formed in 2022, fusing the melodic drive and classic riffing of traditional heavy metal with the rawer, more aggressive tones of black metal. The combination evokes the spirit of bands that straddle the line between NWOBHM-influenced metal and occult black metal.

Spectral Spectrum is a Massachusetts black/heavy metal band formed in 2023, blending the raw, cold edge of black metal with melodic heavy metal songwriting. The project reflects a broader trend in the American underground of pairing traditional metal's hook-driven structures with black metal's atmospheric harshness.

Speedfreak is a Southern/heavy metal band from Chicago, Illinois, formed in 2022, blending the groove and swagger of Southern metal with classic heavy metal riffing in an unusually Northern context.

Speer is a thrash/heavy metal band from Casper, Wyoming, formed in 2014, one of very few metal acts emerging from Wyoming's isolated high plains, playing straightforward metal rooted in classic thrash and traditional heavy metal.

Spell Breaker is a traditional heavy metal band from El Paso, Texas, formed in 2025, playing classic-styled metal drawing on the NWOBHM and American heavy metal traditions from one of Texas's border cities.

SpellBook is a heavy metal and hard rock band from York, Pennsylvania, formed in 2020, playing classic-influenced heavy metal with a foundation in hard rock dynamics and traditional song structures.