Berg Larsen is a saxophone and clarinet mouthpiece maker whose origins trace to London's Archer Street in 1945, when the company's namesake — a professional musician and reed maker — introduced a line of ebonite mouthpieces for reed instruments. The line later expanded into metal mouthpieces, initially in brass and eventually in stainless steel, a material the brand helped popularize for its durability and bright projection. Manufacturing is now based in Borgerhout, Belgium.

The mouthpieces are recognized for their distinctive small chambers and flat side walls, a design that tends to produce a focused, cutting tone favored in jazz, R&B, and studio playing. The catalog spans ebonite (hard rubber) and stainless steel models for alto, tenor, baritone, and soprano saxophones as well as clarinet, with chamber and facing variants historically referred to by names like Duck Bill, Scoop Bill, and Straight Bill. Models are specified using a system combining tip opening, chamber size, and facing length.

Berg Larsen mouthpieces have a long association with professional saxophonists across jazz, fusion, and pop. Sonny Rollins, Jan Garbarek, Pete Christlieb, and Lenny Pickett are among the players who have used Berg Larsen mouthpieces over the decades.

Berg Larsen has 2 products cataloged on Equipboard, including Mouthpieces. Their gear is featured by 2 artists, with the strongest followings in Rock and Jazz. Notable users include Sonny Rollins and Clarence Clemons.