Reiver Guitars is a small-shop luthier brand based in Moffat, Dumfries & Galloway, in southwest Scotland. It operates as a guitar-focused sub-brand of AC Guitars, the same workshop that built a reputation primarily for custom basses. The Reiver name references the border reivers, the raiders who crossed the Anglo-Scottish frontier between the late 13th and early 17th centuries.

The shop's output centers on headless six- and seven-string electric guitars, with models including the Kompakt 6 and Kompakt 7, the ChubstRR series, the SLG (Solid Line Guitar), and the Skelf. Builds are largely custom or short-run, often appearing as one-off prototypes that evolve the underlying designs, and the workshop blog documents construction in progress. Both fixed-bridge and tremolo-equipped configurations have been offered.

Reiver Guitars is closely tied to AC Guitars, and the same builder handles both lines from the Moffat workshop. The brand has drawn attention in extended-range and headless guitar communities such as SevenString.org and theFretBoard, where its compact, ergonomic body shapes and Scottish-built provenance are commonly discussed.

Reiver has 2 products cataloged on Equipboard, including Solid Body Electric Guitars. Their gear is featured by 1 artist, with the strongest followings in Rock, Funk / Soul, and Jazz. Notable users include Abigail Zachko.