Guhyasamāja Tantra
The Guhyasamāja Tantra (Sanskrit: गुह्यसमाजतंत्र, romanized: Guhyasamājatantra, lit. 'Tantra of the Secret Society/Community'; Tibetan: གསང་འདུས་རྩ་རྒྱུད, Wylie: gsang 'dus rtsa rgyud), Tōhoku Catalogue No. (Toh) 442, also known as the Tathāgataguhyaka (Secrets of the Tathagata), is one of the most important scriptures of Tantric Buddhism, written in Sanskrit.