Carruthers Guitars is a custom instrument shop founded by luthier John Carruthers, operating out of a facility in Camarillo, California. John Carruthers began building guitars in the 1960s and established himself at Westwood Music in West Los Angeles before launching his own brand. Beyond his own instruments, he has consulted for major manufacturers including Fender, Ibanez, and Yamaha — contributing to designs such as Ibanez's Joe Pass and Artist Series models, Yamaha's SG, SA, FG and FC guitars and BB basses, and a limited commemorative run of G&L bodies following Leo Fender's death.

The shop produces custom electric guitars and basses alongside offering repairs, restorations, modifications, and vintage tube amplifier servicing. Signature instruments include the SUB-1 upright electric bass and the CSA (Carruthers Semi-Acoustic), as well as solid-body electric guitars and basses built to order. The business operates from a 10,000 square foot facility staffed by professional technicians.

Carruthers instruments have been used by artists including Kim Gordon of Sonic Youth, Jeff Ament of Pearl Jam, Jake E. Lee, Trevor Horn of Yes, and Nash Kato of Urge Overkill. The brand's reputation rests on custom builds and high-end repair work for touring and studio professionals rather than mass-market production.

Carruthers Guitars has 4 products cataloged on Equipboard, including Electric Basses and Fuzz Effects Pedals. Their gear is featured by 6 artists, with the strongest followings in Rock and Pop. Notable users include Kim Gordon, Jeff Ament, and Jake E. Lee.