Thonet GmbH is a furniture manufacturer headquartered in Frankenberg/Eder (northern Hesse) and ranks among the oldest and historically most significant furniture companies in the world. Michael Thonet opened his first workshop in Boppard on the Rhine in 1819. The family business Gebrüder Thonet was formalised in 1853. The Frankenberg production facility has been in continuous operation since 1889 and survived both World Wars. Since 2006 the company trades as Thonet GmbH; family members of the fifth and sixth Thonet generation remain active as shareholders.

The development of the steam bentwood process in the 1850s enabled the first industrial mass production of a chair — the No. 14 (today 214). By 1930, 50 million of this model alone had been sold. During the Bauhaus era, Thonet secured production rights to cantilever chairs by Marcel Breuer, Mies van der Rohe and Mart Stam. The current collection spans bentwood and tubular steel classics alongside contemporary designs. The Museum Thonet in Frankenberg opened in 1989 across 700 square metres.

Thonet furniture is represented in the collections of MoMA New York, the Centre Pompidou Paris, the Vitra Design Museum and numerous other institutions. For architects and planners who require licensed originals without compromise on material quality and manufacturing precision, Thonet — produced exclusively in Frankenberg — remains the only source for the genuine article.