Unsound Circuitry is a one-person guitar effects pedal operation based in Helsinki, Finland, founded in 2021. The builder focuses on hand-crafted devices aimed at ugly, aggressive, and loud sounds, with an aesthetic rooted in underground and DIY culture. Pedals are produced in small batches and sold direct through the brand's webstore.

The lineup centers on fuzz, drive, and glitch-oriented circuits. Notable releases include the KATO Glitch Fuzz, which pairs a fuzz section with a dual-mode glitch footswitch for pitch instability and decay manipulation; the Hyper Pozzum, a take on the Univox Super-Fuzz; and the Woes Dual Band Superdriver, an original discrete analog design using two parallel drive circuits. Other models include the Shivver, Hubert, Polemokori, and Bloodletter, the last of which is also offered as a DIY PCB.

Unsound Circuitry has 1 product cataloged on Equipboard, including Fuzz Effects Pedals.