Zhào Zhēnguān 趙貞觀 (fl. late Ming – early Qīng; precise dates and native place unrecorded). Compiler of the Jiàngxuě dānshū 絳雪丹書 (KR3ed032), a specialised gynaecological / postpartum formulary in 1 juǎn. His work transmits a substantial portion of the Zhúlínsì (竹林寺) Buddhist monastic gynaecological tradition centred at Hángzhōu, with the Five Acute Nineteen Critical (五急十九危) postpartum-emergency classification. Not in CBDB; no other biographical record.