Zhāng Yù 張預 (fl. late 19th c., 清), late-Qīng literatus. Wrote the 光緒辛丑 (1901) preface to 陳其瑞’s Běncǎo cuōyào 本草撮要 (KR3ec055), praising Chén’s clinical effectiveness in his work at the Sūzhōu prefectural medical clinic. No further biographical detail securely attested; no CBDB record.