Zhōu Dānchén 周丹忱 of Sìmíng 四明 (Níngbō, Zhèjiāng) — late-Qīng prefacer of the 1856 (Xiánfēng bǐngchén) wood-block edition of 單南山 Shàn Nánshān’s Tāichǎn zhǐnán (KR3ei053). His preface supplies the principal transmission history of the work — its origin as a manuscript under Shàn Nánshān’s name, its circulation via 錢升穟 Qián Shēngsuì, and its eventual print at the Ōu family Zhōngxiàn dì mansion. No further biographical detail is recorded; not in CBDB.