Lalitagiri is a major Buddhist complex in the Indian state of Odisha. The complex is home to stupas, 'esoteric' Buddha images, and monasteries (viharas), which is the oldest site in the region. Significant finds at this complex include Buddha's relics. Tantric Buddhism was practiced at this site.

Ratnagiri is the site of a ruined mahavihara, once the major Buddhist monastery in modern Odisha, India. It is located on a hill in between the Brahmani and Birupa rivers in Jajpur district. It is close to other Buddhist sites in the area, including Lalitagiri and Udayagiri, and 100 km (62 mi) from the state capital Bhubaneswar and 70km from the former state capital Cuttack.