The House of the Blackheads (Latvian: Melngalvju nams, German: Schwarzhäupterhaus) is a building situated in the old town of Riga, Latvia. The original building was erected during the first third of the 14th century for the Brotherhood of Blackheads, a guild for unmarried merchants, shipowners, and foreigners in Riga. Major works were done in the early 17th century, adding most of the Mannerist ornamentation. The sculptures were made by the workshop of August Volz. Additionally, it is the site of the first decorated Christmas tree, which was erected in 1510.