Deutschordensmuseum, Medieval castle museum in Bad Mergentheim, Germany

The Deutschordensmuseum occupies the Hochschloss of the former residence of the Grand Masters of the Teutonic Order in Bad Mergentheim, with around 3000 square metres of exhibition space since 1996. Its departments cover the history of the Order, the town's past, the Mörike-Kabinett, the Neolithic period in the Tauber valley, a dollhouse collection and the Adelsheim antiquities collection.

In 1864 Baron Carl Joseph von Adelsheim bequeathed his antiquities collection to the town of Mergentheim; it was shown in a single town-hall room for 63 years. From 1927 the expanded municipal collection occupied five rooms, a corridor and the chapter house on the second floor of the former residence of the Teutonic Order's Grand Masters. A separate Teutonic Order museum opened in 1961, and since 1973 the collections have been presented under the name Deutschordensmuseum.

The museum's name comes from the Teutonic Order, which settled in Mergentheim in 1219 and held the town until 1809. The Mörike-Kabinett, kept since 2004, recalls the poet Eduard Mörike, who lived here with his sister Klara from 1844 to 1851. A large diorama of over 2,000 tin figures restages the 1645 Battle of Herbsthausen of the Thirty Years' War.

The museum occupies the entire upper castle (Hochschloss) of the former Teutonic Order residence, with around 3000 square metres of exhibition space spread over several floors. The building is wheelchair accessible. Since 2023 it has been administered by the Staatliche Schlösser und Gärten Baden-Württemberg under the official name Residenzschloss Mergentheim.

The museum's Jewish artist section shows works by Hermann Fechenbach, who had to emigrate in 1938; the museum now curates his extensive artistic estate. A large diorama with over 2,000 tin figures stages the Battle of Herbsthausen near Mergentheim in the Thirty Years' War. Since 2005 the Mergentheim Engel Pharmacy has also been staged, with a baroque dispensing table and scale holder from 1746.