Zephyr FX is a small, hand-built guitar effects pedal maker based in Krasnodar, Russia. The operation focuses on boutique runs of fuzz, distortion, and overdrive circuits, many of which are interpretations or clones of well-known designs from other builders, packaged in custom-painted enclosures.

The lineup has included pedals such as the Sunn Bro (a high-gain distortion/fuzz voiced after the power section of a cranked Sunn Model T), the Neolith fuzz/distortion/booster with a switch to tailor the circuit for bass or guitar, the Sonnenhosen (a combined RAT-style distortion and Sunn-flavored FET preamp), and the single-knob Grim Fuzz. The brand sells primarily through Reverb, where it has maintained a shop since 2015.

Zephyr Fx has 5 products cataloged on Equipboard, including Overdrive Effects Pedals and Effects Pedal Accessories.