Shìhéng 士衡 (lifedates unknown, fl. late 12th – early 13th c.), Southern-Sòng Tiāntāi 天台 monk, resident at Yúnjiān 雲間 (modern Sōngjiāng 松江, in greater Shànghǎi). Designated 雲間沙門 (“monk of Yúnjiān”) in his self-attribution at the head of KR6r0068 Tiāntāi jiǔzǔ zhuàn.
He is the compiler of the 《天台九祖傳》 Tiāntāi jiǔzǔ zhuàn (KR6r0068, T2069), a 1-juan biographical compendium of the nine patriarchs of the Tiāntāi school — Lóngshù 龍樹 (Nāgārjuna), Huìwén 慧文, Huìsī 慧思, Zhìyǐ 智顗, Guàndǐng 灌頂, Zhìwēi 智威, Huìwēi 慧威, Xuánlǎng 玄朗, and Zhànrán 湛然 — with an authorial preface (序) dated Jiādìng 嘉定 1 (1208). The colophon text gives Shìhéng’s life nothing further than this Yúnjiān residence and Tiāntāi affiliation; he is otherwise unattested. Per DILA Buddhist Person Authority A000050.
Works in the Kanripo corpus: KR6r0068 Tiāntāi jiǔzǔ zhuàn.