Fastback is a Seattle-area custom guitar shop established in 2010 by Mark Naron and Bob Kelley. Based in the Shoreline/Seattle, Washington area, the company designs and hand-builds electric guitars, pickups, effects pedals, and tube amplifiers in small numbers, with a focus on traditional construction and vintage-inspired tones.

The lineup includes original guitar designs such as the Cabo, alongside in-house wound pickups. On the amplifier side, builder Dave Kracke develops Fastback's tube amps, including the Custom 22 S/C — a 22-watt 6V6 combo or head with a multi-position voicing switch — and the Custom 100 S/C, a hand-wired, point-to-point head modeled after a 1969 Marshall Super Lead, with added features like a built-in boost, 50-watt switch, and bright and voicing toggles.

The shop operates as a boutique builder rather than a production brand, and is closely tied to Fastback Studios, the Seattle recording facility Mark Naron also runs. Its instruments and amps tend to circulate in the Pacific Northwest player and studio scene through outlets like Mike & Mike's Guitar Bar and Emerald City Guitars.

Fastback has 4 products cataloged on Equipboard, including Overdrive Effects Pedals and Electric Guitar Pickups. Their gear is featured by 5 artists, with the strongest followings in Rock, Metal, and Folk, World, & Country. Notable users include Ryan "Fluff" Bruce, Tony Cappochi, and Rob Scallon.