Fish Circuits is a boutique effects pedal builder based in Montréal, Québec, Canada, founded and operated by Mike Poisson and Simon, who design and hand-build each pedal in small quantities. The company takes a somewhat unconventional approach to pedal design, favoring preset-style controls and unusual signal routing over the more common knob-per-parameter layout.

The lineup includes the Model One overdrive, which covers a wide range from amp-like breakup to fuzzier high-gain textures via a "Body" switch that shapes low-end response, and the Lunatique, a gated fuzz with a chaos control that layers in filtering, ring modulation, octave, and gating effects. Other releases include the Astronomie, a digital spring reverb with three decay settings, three tone presets, adjustable feedback, and a dynamic volume-ducking behavior, and the Echo Limiteur delay.

Pedals are sold direct through the Fish Circuits website and through a network of boutique dealers including Motor City Guitar, Perfect Circuit, Eclipse Music, and Guitar Center, and have been reviewed in outlets such as Premier Guitar.

Fish Circuits has 2 products cataloged on Equipboard, including Overdrive Effects Pedals and Reverb Effects Pedals. Their gear is featured by 1 artist, with the strongest followings in Rock, Pop, and Jazz. Notable users include Daniel Kim.