The Thienemann Archive is a collaborative genealogical resource dedicated to preserving and sharing the history of the Thienemann family and its related families. Drawing on earlier family histories by Heinrich Gottfried Thienemann and Otto Wilhelm Thienemann, it traces a lineage spanning roughly 500 years, from Nickol Duhnemann, born around 1526, to descendants across generations and countries. The archive documents the evolution of the family name, including the forms Duhnemann, Dienemann, Thünemann, Tienemann, Thienemann and Thieneman.

Visitors can search people, families, surnames, places and historical records, and explore family trees, cemeteries, headstones, photographs, documents and other media. Its research resources include records such as birth, baptism, marriage and death certificates, as well as wills, obituaries and newspaper articles. The archive also invites families to contribute information, documents, photographs and burial details, helping preserve these materials for future generations. Records are assigned identifying numbers and dates, with an offline database and physical files maintained alongside the online collection.