One of the five major sūtra groups contained within the Kangyur.

The Ratnakūṭa section of the Kangyur (Toh 45–93) is a distinct collection, also found in the Chinese Tripiṭaka (Taishō 310), of forty-nine selected sūtras on a range of themes. In some titles and colophons the collection is presented as a single sūtra with its component texts as chapters.