The Mahāratnakūṭa Sūtra (Sanskrit; traditional Chinese: 大寶積經; simplified Chinese: 大宝积经; pinyin: dàbǎojī jīng, Tib. dam-chos dkon-mchog-brtsegs-pa) is an ancient collection of Mahāyāna Buddhist sūtras. It is also known simply as Ratnakūṭa Sūtra (寶積經), literally the Sutra of the Heap of Jewels in Sanskrit (kūṭa means ‘accumulation’ or ‘heap’).
The Mahāratnakūṭa Sūtra contains 49 texts of varying length, which are termed "assemblies" by tradition. This text was translated into Chinese by Bodhiruci in the 8th century, between 707 and 713 CE. This collection includes the Śrīmālādevī Siṃhanāda Sūtra, the Longer Sukhāvatī-vyūha Sutra, the Akṣobhya-vyūha Sūtra, a long text called the Bodhisattvapiṭaka, and others.
The Ratnakūṭa collection totals 49 Mahāyāna sūtras, divided into 120 fascicles in the Chinese translation. Garma Chang, who has translated a number of sūtras from the Mahāratnakūṭa from Chinese into English, summarizes the breadth and variety of texts contained in this collection:
We have found this work to contain a broad coverage of various subjects. The topics discussed range from the monastic precepts (Vinaya) to intuitive wisdom (prajñā), from good deportment to the manifestation of the Tathāgata's light, from illusion (māyā) to ingenuity (upāya) to the nature of consciousness and the Pure Land practice. It can perhaps be called a small encyclopedia of Mahāyāna Buddhism, which should be useful to general readers as well as to scholars.
In the Taishō Tripiṭaka, the sutras are texts numbered 310 through 373 in volumes 11 and 12a.
According to the Nikāyasaṅgraha (a Theravādin text), the Ratnakūṭa Sūtra was composed by the "Andhakas", meaning the Mahāsāṃghika Caitika schools of the Āndhra region.