Barn3 is a small effects pedal accessory maker based in Palmerton, Pennsylvania, founded in 2013 by siblings Ryan and Chontey along with their friend Tom. The company began when Ryan built a custom auxiliary footswitch out of narrow metal tubing for Tom's Eventide Factor pedal; after posting the build online and receiving requests from other players, the trio turned it into a business.

The brand specializes in compact auxiliary switches designed to expand the functionality of existing effects pedals. Their breakthrough product, the OX9, released in 2015, is a dedicated aux switch for the Eventide H9 that mounts tightly alongside the host pedal to save pedalboard real estate. Barn3 later introduced the OX for Eventide Factor pedals and the patent-pending OXU line — a universal aux switch available in Mini, Standard, and Three form factors — intended to work with momentary-switch-compatible pedals from manufacturers including Eventide, Line 6, Strymon, Meris, Boss, and Source Audio.

All Barn3 products are designed, assembled, and shipped from Pennsylvania. The company occupies a niche corner of the pedalboard ecosystem, focused on purpose-built switching accessories rather than effects themselves, and its products are sold through retailers such as Sweetwater, Guitar Center, Reverb, and Thomann.

Barn3 has 4 products cataloged on Equipboard, including Effects Pedal Accessories and Switch Effects Pedals. Their gear is featured by 7 artists, with the strongest followings in Rock, Blues, and Folk, World, & Country. Notable users include Troy Van Leeuwen, Ariel Posen, and Billy Strings.