Sundberg is a Swedish acoustic guitar workshop founded and run by master luthier David Sundberg, based in Åkers Styckebruk. Each instrument is handmade to the individual customer's specifications, with the choice of tonewoods, body size, and appointments agreed on before construction begins. The shop maintains a tightly controlled environment for humidity and temperature so the wood stabilizes properly before and during the build.

The brand is known for small-batch, custom acoustic flat-tops, and also produces a model line called Heartworn. Players associated with Sundberg's instruments include Ryan Adams, Keith Richards, Mark Olson, Ulf Wakenius, Ane Brun, Lars Winnerbäck, and Anna Ternheim.

Sundberg has 2 products cataloged on Equipboard, including Solid Body Electric Guitars and Steel-string Acoustic Guitars. Their gear is featured by 3 artists, with the strongest followings in Rock, Pop, and Folk, World, & Country. Notable users include Nicholaus Arson, Niklas Almqvist, and Anna Ternheim.