The data collection complements the dissertation thesis “Craft Production in the Mongol Empire. Karakorum and its Artisans” in the field of Pre- and Early Historical Archaeology by Susanne Reichert. It presents all finds, samples, and other iron items during excavations carried out by Bonn University together with the Archaeological Institute of the Mongolian Academy of Sciences from 2000 to 2005 in the middle of Karakorum (13th to early 15th century), the first capital of the Mongol Empire. The data comprises information on storage, descriptions, measurements, and interpretative categories.