The Laṅkāvatāra Sūtra (Sanskrit: लङ्कावतारसूत्रम्, "Discourse of the Descent into Laṅkā", Standard Tibetan: ལང་ཀར་བཤེགས་པའི་མདོ་, Chinese: 入楞伽經) is a prominent Mahayana Buddhist sūtra. It is also titled Laṅkāvatāraratnasūtram (The Jewel Sutra of the Entry into Laṅkā, Gunabhadra's Chinese title: 楞伽阿跋多羅寶經 léngqié ābáduōluó bǎojīng) and Saddharmalaṅkāvatārasūtra (The Sutra on the Descent of the True Dharma into Laṅkā). A subtitle to the sutra found in some sources is "the heart of the words of all the Buddhas" (一切佛語心 yiqiefo yuxin, Sanskrit: sarvabuddhapravacanahṛdaya).
The Laṅkāvatāra recounts a teaching primarily between Gautama Buddha and a bodhisattva named Mahāmati ("Great Wisdom"). The sūtra is set in mythical Laṅkā, ruled by Rāvaṇa, the king of the rākṣasas. The Laṅkāvatāra discusses numerous Mahayana topics, such as Yogācāra philosophy of mind-only (cittamātra) and the three natures, the ālayavijñāna (store-house consciousness), the inner "disposition" (gotra), the buddha-nature, the luminous mind (prabhāsvaracitta), emptiness (śūnyatā) and vegetarianism.
