Etherial Guitars is an Australian custom instrument builder founded by Matthew Brown, an industrial designer trained at the University of Technology Sydney. The company specializes in electric guitars and basses constructed largely from non-traditional materials such as carbon fiber, aluminum, and stainless steel, with the stated goal of challenging the conventional timber-based approach to instrument building. Brown's work blends artisanal lutherie with industrial design techniques drawn from over a decade spent working with composites, metals, and polymers.

The brand offers instruments across several tiers, including its Production Artistry line, fully custom builds, and signature pieces such as the CS Carbon 7. Designs lean toward sculpted, geometric body shapes, with an emphasis on rigidity, resonance, and stability that the materials are intended to provide. The instruments are positioned as both playable tools and visual objects, aimed at players from intermediates through professionals seeking something outside the standard bolt-on or set-neck timber template.

Etherial has 4 products cataloged on Equipboard, including Extended Range Guitars and Solid Body Electric Guitars. Their gear is featured by 1 artist, with the strongest followings in Rock and Metal. Notable users include Lucas Mann.