Ballroom Pavilion in Wilhelmshöhe Park, Ballroom pavilion in Wilhelmshöhe Park, Germany.

The Ballhaus stands beside Schloss Wilhelmshöhe in Bergpark Wilhelmshöhe. Leo von Klenze built it in 1808/1809 with a plain exterior; inside, Johann Conrad Bromeis added a large ballroom with painted decoration in 1828 for Elector Wilhelm II. The building is managed by Museumslandschaft Hessen Kassel.

The Ballhaus was built in 1808/1809 by Leo von Klenze for Jérôme Bonaparte, King of Westphalia and Napoleon's youngest brother, during his short reign in Kassel. It first served as a theatre. The ornate interior, including the large painted ballroom, dates from 1828, when the Kassel architect Johann Conrad Bromeis remodelled it for Elector Wilhelm II.

The building is called Ballhaus after the balls later held in its great hall, although Jérôme Bonaparte had it built as a theatre. The painted ballroom that visitors see was created in 1828, when the Kassel architect Johann Conrad Bromeis remodelled the interior for Elector Wilhelm II. The Museumslandschaft Hessen Kassel administers the house.

The Ballhaus stands directly beside Schloss Wilhelmshöhe in Bergpark Wilhelmshöhe, so it is reached on foot along the park paths from the palace; the grounds climb steeply in places. The building is managed by the Museumslandschaft Hessen Kassel, which sets access to the interior.

The plain exterior gives no hint of the painted ballroom inside, added in 1828 by architect Johann Conrad Bromeis for Elector Wilhelm II. The building itself went up in 1808/1809 to plans by Leo von Klenze for Jérôme Bonaparte, Napoleon's youngest brother, and first served as a theatre.