Hauptstaatsarchiv Stuttgart, Regional archive in Stuttgart, Germany.

The Hauptstaatsarchiv Stuttgart is a state archive that holds documents, maps, and records spanning from the 8th century to the present day. Its collections document the administrative history of Baden-Württemberg and the surrounding region.

The archive's building was rebuilt between 1963 and 1969 on the site of a neoclassical predecessor heavily damaged in World War II. Until 2005 it was an independent authority; since then it has been a department of the Landesarchiv Baden-Württemberg, founded that year. Its holdings include the records of the county and duchy of Württemberg up to 1806 and of territories mediatized to Württemberg around 1803.

The archive's holdings are divided into 15 series coded by letters, such as Series A for the Old Württemberg Archive and Series H for document selections. Each file carries a compound signature used for ordering and citation, for example A 204 Bü 278 for the 1803 protocols of the Privy Council. Series N gathers maps and plans, including a 16th-century printed map of the Duchy of Württemberg.

The archive is located in the city center and provides work spaces for visitors who want to research the collections. Regular guided tours for groups and school classes help visitors understand what is available and how to navigate the materials.

The archive displays rotating exhibitions in its foyer that focus on particular topics from the past. During the museum night event, it opens special displays of rare historical papers and reveals the work usually hidden from public view.