Lokeshvara Guhyasamaja (Lord of the World, Secret Assembly) is a Buddhist meditational deity that arises from the Guhyasamaja root text Sarva Tathagata Kaya Vag Chitta Rahasya Guhyasamaja Nama Maha Kalpa Raja Tantra (4th-5th century C.E.). The Lokeshvara form was popularized by Atisha Dipamkara.