Quèyǎn 慤沇 (lifedates unknown), Tang-period Buddhist monk and Śūraṅgama-sūtra commentator, named alongside 惠振 Huìzhèn as one of the Tang masters whose commentarial work on the Śūraṅgama was synthesised by 子璿 Chángshuǐ Zǐxuán in the Sòng. The reference is in 來舟 Lái Zhōu’s preface to KR6b0009 Dàshèng běnshēng xīndìguān jīng qiǎnzhù xuánshì. No biographical material survives.