A Giant Church () or Noise Church () is a large, stone-age stone building that can be found in Ostrobothnia and on the northern shores of Bothnian Bay.
The giant churches are Neolithic stone structures, specific to the coastal region between Yli-Ii and Närpes in Ostrobothnia. They date from 2500-2000 BCE, and are concentrated on the old coast. Most of these have been built on islands or on landforms, but can now be moved up to 30 kilometers indoors due to the postglacial rebound. There are between 40 and 50 depending on the definition you choose. The churches of the giant are usually rectangular, their length can go from about 12 to 60 meters Their height is low, between half a meter and 2 meters in some cases.
The function of giant churches has been a topic of debate for over a century. They were considered as dwellings, burial places, temples, fortresses, natural formations, giant cold storage for seal meat or game. Some of the smaller buildings may have been used as dwellings, but larger ones would have been impractical for this purpose. There were no signs of permanent habitation within these structures. In 2009, researchers Marianna Ridderstad and Jari Okkonen published a mapping and indicate that the axis and openings of the giant churches are oriented towards sunrise and sunset. This is typical of many megalithic cultures of Europe. The giant churches are reminiscent of the megalithic lines of Carnac, such as the Crucuno dolmen or the Kermario alignments and the Manio.