The Bad Nauheim Jugendstil Association (Jugendstilverein) is a private body founded in 1997 to maintain and promote the unique, fully preserved Art Nouveau fountain square (Sprudelhof) spa in Bad Nauheim, Germany.

The young architect Wilhelm Jost constructed the Jugendstil buildings and facilities between 1905 and 1911. Arcades line the central fountain square, leading to six bath houses, each with a waiting hall and open courtyard surrounded by corridors with bath cells. The sculptor Heinrich Jobst, the ceramist Julius Scharvogel, the painter Friedrich Wilhelm Kleukens and others from the Mathildenhoehe artists' colony in Darmstadt contributed invaluable decorative additions.

Bad Nauheim was then internationally known as a spa where heart diseases were treated with the town's carbonic-acid- and salt-containing thermal waters. As medicinal baths became less important in recent decades, the Sprudelhof Foundation (Stiftung Sprudelhof) was established in 2008 to find a new use for the once famous spa buildings.

The Jugendstil Association, with over 400 members, endeavours to maintain and preserve this heritage and has taken steps to set up an Art Nouveau Centre (Jugendstilzentrum) in one of the bath houses.