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The Śūraṅgama Sūtra (Sanskrit: शूरङ्गमसूत्र; traditional Chinese: 大佛頂首楞嚴經) (Taisho 945) is a Mahayana Buddhist sutra that has been especially influential in Chan Buddhism. The general doctrinal outlook of the Śūraṅgama Sūtra is that of esoteric Buddhism and Buddha-nature, with some influence from Yogacara. There have been questions regarding the translation of this sutra as it was not sponsored by the Imperial Chinese Court and as such the records regarding its translation in the early eighth century were not carefully preserved (see ); however, it has never been classified as apocrypha in any Chinese-language Tripitakas including the Taisho Tripitaka where it is placed in the Esoteric Sutra category (密教部). The sutra was translated into Tibetan during the late eighth to early ninth century