Batak architecture refers to the related architectural traditions and designs of the various Batak peoples of North Sumatra, Indonesia. There are six groups of Batak who speak separate but related languages: the , the Mandailing to the south, the Toba, to the north the /, the Simalungun, and the Karo. While the groups are now Muslim or Christian, elements of the ancient Batak religion remain, particularly amongst the Karo.