McSwain is a boutique electric guitar builder based in Portland, Oregon, founded by luthier Stephen McSwain. Originally from North Carolina, McSwain produces a small, hand-numbered run of instruments each year, each signed by the builder and built to client specifications. The shop's aesthetic leans on classic Americana imagery paired with original body designs.

The flagship lineup centers on the SM-1 and SM-2 body shapes, intended to combine the depth of a Les Paul with the versatility of a Stratocaster. A signature feature across the line is the patented McSwain ToneLayer aluminum fretboard binding, used alongside ebony necks. Pickups are typically supplied through a partnership with Los Angeles–based Homewrecker Pickups.

McSwain instruments have been built or commissioned for players including Slash and Steve Jones of the Sex Pistols, with a Fear & Loathing series SM-2 noted among Slash's collection. The brand operates a small Portland showroom and works with select boutique dealers such as The Music Zoo and Boutique Guitar Showcase.

McSwain has 6 products cataloged on Equipboard, including Solid Body Electric Guitars. Their gear is featured by 5 artists, with the strongest followings in Rock. Notable users include Ben Moody, Jared Leto, and Slash.