Hessisches Hauptstaatsarchiv, State archives in Wiesbaden, Germany.

The Hessian Central State Archives, Wiesbaden, is a department of the Hessian State Archives housed in a building on Mainzer Straße that was erected in 1881 and extended with a repository building in 1908/1909. It preserves 65,004 documents from 910 to about 1850, roughly 50 shelf-kilometres of files and official books, some 196,000 maps and plans, about 261,000 photographs, and a library of over 100,000 volumes.

The archives trace back to the records of the Nassau counties and principalities; in 1806 the Duchy of Nassau was formed with Wiesbaden as capital, and the Nassau-Usingen government archive in Idstein Castle became its central archive. After Prussia annexed Nassau in 1866, a new archive building was erected on Mainzer Straße in Wiesbaden in 1881, extended by a repository in 1908/1909. After the founding of the State of Hesse in 1945 it became one of three Hessian state archives, and since 2018 it is the Hauptstaatsarchiv department of the Hessian State Archives.

The archive's name changed with each political order: Prussian State Archives until 1945, State Archives until 1958, Central State Archives until 1963, Hessian Central State Archives since 1963, and since 2018 a department of the Hessian State Archives. Its holdings are grouped into six sections, from the Holy Roman Empire and the Duchy of Nassau to the State of Hesse and non-state collections.

Parts of the collection are digitized and accessible through an online database system, allowing an overview from a distance. For in-depth research or access to original documents, a visit in person is advisable.

Among the holdings are 65,004 charters dating from 910 to about 1850, the oldest documents in the institution. They sit alongside roughly 50 shelf-kilometres of files, some 196,000 maps and plans, about 261,000 photographs and a library of over 100,000 volumes.