Greuter Audio is a Swiss manufacturer of boutique guitar effect pedals founded by Sascha Greuter and operated out of a small workshop in Zürich. Each pedal is built by hand, with components selected, matched, and calibrated by ear, an approach the company has carried since its early days as a one-person operation that grew out of pedal modifications and repair work.

The lineup focuses on analog overdrive, fuzz, modulation, and wah circuits. Notable models include the Fuller Drive overdrive, the Moonlight (a Fuzz Face-style fuzz), the Star Bender (modeled on a Tonebender MkIII), the Natural Selection overdrive with op-amp/diode circuitry and a three-band active EQ, the Fokus boost, and the Vibe modulation pedal. Beyond its own product line, the workshop also offers guitar modifications, vintage pedal restoration, and Roland Space Echo servicing, alongside hand-built Toaster and patch cables.

Greuter has 3 products cataloged on Equipboard, including Fuzz Effects Pedals, Univibe & Rotary Effects Pedals, and Overdrive Effects Pedals. Their gear is featured by 1 artist, with the strongest followings in Rock and Blues. Notable users include Chris Buck.