Shāng-jié-luó-zhǔ púsà 商羯羅主菩薩 (Śaṅkarasvāmin) was a sixth-century Indian Buddhist logician, traditionally remembered as a direct disciple of 大域龍菩薩 (Dignāga). His one surviving work is the Nyāyapraveśa “Introduction to Logic” — translated by 玄奘 in Zhēnguān 21 (647) at the Hóngfú-sì 弘福寺 as 因明入正理論 KR6o0003 — a short propaedeutic to Dignāga’s mature Nyāyamukha KR6o0001 / KR6o0002 which became the standard introductory text for hetuvidyā in the East Asian Cí’ēn / Fǎxiàng 法相 tradition. Sanskrit and Tibetan parallels survive: the Sanskrit was edited by Mironov (1931) and Dhruva (1930), and the work also exists in a Tibetan translation by Jinendrabodhi. The catalog entry for KR6o0003 reads the name as 南羯羅主菩薩 by error; the source text and CANWWW both read 商羯羅主菩薩, and that is the orthography preserved in every derivative commentary. Lifedates are entirely conjectural; he is conventionally placed in the second half of the sixth century, after Dignāga and before Dharmakīrti.