Sāng Shìchāng 桑世昌 (fl. ca. 1190–1210), zì Zémín 澤民, was a Southern Sòng Huáihǎi 淮海 (Yángzhōu region) man whose family lived for generations at Tiāntái 天台 (Zhèjiāng). A nephew of Lù Yóu 陸游, he was a Lántíng xù 蘭亭序 specialist of the late Southern Sòng — Yè Shì’s 葉適 Shuǐxīn jí 水心集 colophon for his work calls him “the deeply versed Lántíng connoisseur of his age”. His one surviving work, the Lántíng kǎo KR2n0022 in 12 juan (originally Lántíng bóyì 蘭亭博議, 15 juan), is the principal Sòng-era critical study of the Lántíng xù and of the Dìngwǔ stone-cutting tradition. He was also a competent poet — Yè Shì’s colophon quotes lines such as “cuìtiān línqiàn zhú, hóngzhào wūshān huā” — and the catalog meta records him as “fl. 1208”. CBDB 18170 records the figure but no dates.