Markgrafenschloss Günzburg, Habsburg castle in Günzburg, Germany.

Markgrafenschloss is a three-wing castle complex in the southwest corner of Günzburg's old town, built from 1577 to 1586 by Italian architect Alberto Lucchese for Archduke Ferdinand II of Tyrol. The south and north wings were destroyed in a bombing raid on 9 April 1945 and rebuilt after the war. The south wing was renovated by 2022; the building now largely houses the tax office (Finanzamt).

The complex was reconstructed between 1577 and 1586 under Italian architect Alberto Lucchese for Archduke Ferdinand II of Tyrol. This rebuilding work demonstrates the influence of Italian Renaissance architecture on Habsburg residences north of the Alps.

The castle shapes Günzburg's identity as a symbol of Habsburg rule and shows Austrian building traditions in Bavaria. Its spaces reflect influences from different periods and tell of centuries-long connections between the two regions.

The castle now serves largely as a tax office (Finanzamt), so interior access is limited to official business; the local history museum that was once in the south wing has moved to the former Piarist building. The complex stands in the southwest corner of the old town, next to the former court church and today's town hall, and is reached on foot. Since 2016 the building has been under general renovation, with work on the south wing completed in 2022.

The building was long the only remaining Habsburg residence palace on German territory, making it a rare legacy of Austrian rule. This special status makes it an important witness to the political ties between Bavaria and Austria.