Xú Fèng 徐鳳 (hào Xìnzhāi 信齋, fl. ca. 1430–1450, 明), early-Míng acupuncturist of Tāngxī 塘溪 in Jiāngxī 江西. Pupil of Xú Yán 徐巖 (whose teaching he credits in his own preface). His 1439 Zhēnjiǔ dàquán 針灸大全 (KR3ee002) is the foundational Míng systematization of Zǐwǔ liúzhù 子午流注 chronoacupuncture — Xú tabulated, in usable clinical form, the hour-by-hour acupoint sequences and the Língguī bāfǎ 靈龜八法 / Fēiténg bāfǎ 飛騰八法 computations governing the eight confluent points of the extraordinary vessels. The text was the principal source from which Yáng Jìzhōu 楊繼洲 (KR3ee027) and the later Ming–Qīng acupuncture curriculum drew. No lifedates are securely recorded; CBDB lists several homonymous figures, none of which match the Ming acupuncturist with confidence (the only dated record, c_personid 45115, is a Sòng/Jīn-era figure, 1177–1224, not the Ming physician). The catalog meta gives dynasty 明, which is followed here.