Somapura Mahavihara (Sanskrit; Bengali: সোমপুর মহাবিহার Shompur Môhabihar) in Paharpur, Badalgachhi Upazila, Naogaon District, Bangladesh is among the best known Buddhist viharas in the Indian subcontinent. It is one of the most important archaeological sites in the country. It was designated a UNESCO World Heritage Site in 1985.