SZ is a boutique electric guitar and bass workshop based in Buenos Aires, Argentina, founded and run by luthier Nicolás Sznajderman. After studying industrial design at UTN Argentina, Sznajderman turned his focus to building stringed instruments by hand, with an emphasis on a retro-futuristic aesthetic and original body shapes rather than reproductions of classic American designs.

The lineup centers on a series of original models including the Valiant, Polara, Rambler, Torino, Brava, Taunus, Impala, and Jandrid, with bass versions of the Brava and Torino. Each instrument is built to order in the Avellaneda workshop, with custom finishes, hardware choices, and pickup configurations available to buyers.

The brand has gained visibility through Argentine artists such as Dante Spinetta, Lula Bertoldi of Eruca Sativa, and Juan Saraco of Duratierra, as well as Alex Trimble of Two Door Cinema Club, helping establish SZ as one of the better-known South American boutique guitar makers.

SZ has 2 products cataloged on Equipboard, including Solid Body Electric Guitars. Their gear is featured by 2 artists, with the strongest followings in Rock, Electronic, and Pop. Notable users include Alex Trimble and Willy Fishman.