SG Strings is a Brazilian string brand produced by IZZO Musical Instruments, a São Paulo–based company founded in 1918. The "SG" stands for "Sound Generation," and the line covers a broad range of stringed instruments common in Brazilian music, including electric guitar, steel- and nylon-string acoustic guitar, bass, ukulele, viola caipira, and cavaquinho.

The brand operates one of Latin America's largest string manufacturing plants, with production handled in-house using imported raw materials and European machinery. Beyond standard nickel-plated and bronze sets, SG Strings offers the SG+ line with a nano-coating intended to slow oxidation, and signature sets developed with Sepultura guitarist Andreas Kisser. The brand's distribution reaches more than thirty countries.

SG Strings has 2 products cataloged on Equipboard, including Strings. Their gear is featured by 2 artists, with the strongest followings in Rock, Metal, and Folk, World, & Country. Notable users include Andreas Kisser and Ton Cikoski Radaell.