Dunn Effects is a boutique guitar pedal operation founded in 2015 by Matthew Dunn and based in Saint Louis, Missouri. Dunn etches, drills, assembles and wires every pedal himself in a home workshop, releasing standard models in small batches to a mailing list and taking custom builds to order. The workshop's focus is on heavy, aggressive tones — fuzz, overdrive and distortion — and pedals are tuned to respond well on both guitar and bass.

The lineup is best known for loud, character-driven dirt boxes. The Deceiver distortion and its larger sibling the Grand Deceiver are core offerings, and the Death Knob is a blendable HM-2 style EQ pedal that shapes a Boss HM-2 frequency profile around any dirt signal. Other builds include the Pvrifier lo-fi filter drive and the Black Pedal, an HM-2 inspired distortion. Dunn Effects has also collaborated with Electronic Audio Experiments on the Laggard, a delay/fuzz pedal.

Distribution is largely direct through the Dunn Effects site and Reverb, with UK availability through Boost Guitar Pedals. Every pedal carries a lifetime guarantee that transfers between owners.

Dunn Effects has 4 products cataloged on Equipboard, including Overdrive Effects Pedals, Fuzz Effects Pedals, and Distortion Effects Pedals. Their gear is featured by 2 artists, with the strongest followings in Electronic and Rock. Notable users include Alan Day and Matt Lange.