Gear Supply Co. is a guitar accessories and effects brand founded by Joshua Koterba and based in Lincoln, Nebraska. The company started as a direct-to-consumer subscription service for guitarists, shipping hand-wound strings, premium delrin picks, straps, cables, and other consumables on a monthly basis, with plans tailored to electric, acoustic, bass, and heavy-gauge players.

The brand expanded into effects pedals through a Kickstarter campaign, working with pedal builder Paul Spears on a small line of hand-wired analog circuits. Notable models include the Light Drive, a transparent overdrive with a low-end control; the Harmonic Tremolo, an all-analog vintage-style tremolo with a harmonic saturation knob; and the Dynamic Compressor, which includes a wet/dry blend control. The pedals are sometimes labeled with the GSCO abbreviation on their enclosures.

Gear Supply Co. has 7 products cataloged on Equipboard, including Strings and Picks & Pick Holders. Their gear is featured by 3 artists, with the strongest followings in Rock and Pop. Notable users include Weston Hine, Blake Jordan Tallent, and Joshua Valle.