Andreas Christensen was a Danish piano manufacturer based in Copenhagen, producing instruments from the early 20th century through around 1960. The company built grand and upright pianos and became closely associated with the Danish Modern and Art Deco design movements, collaborating with leading architects and designers of the era including Poul Henningsen, Torben Christensen, Bent Helweg-Møller, and Alfred Skjøt-Pedersen.

The most celebrated instrument to come out of the workshop is the PH Grand Piano, designed by Poul Henningsen and introduced in 1937. With its transparent skeletal cabinet and exposed action, the PH Grand became a landmark of modernist instrument design and is held in collections at the Metropolitan Museum of Art in New York and the Designmuseum Danmark in Copenhagen. The firm also produced upright pianos and spinets in similarly distinctive cases, often featuring teak, rosewood, mahogany, or elm veneers paired with steel or chromed legs.

Andreas Christensen pianos are valued today as vintage and collectible instruments, sought after both for their tonal character — including a 'floating soundboard' construction — and for their place in Scandinavian design history. Examples regularly surface on the secondhand market through dealers and auction houses specializing in mid-century Danish design.

Andreas Christensen has 1 product cataloged on Equipboard, including Upright Pianos.