Jiāng Bǐngzhāng 姜炳璋 (1709–1786), hào Báiyán 白巖, was a mid-Qiánlóng-period Shī-class scholar and provincial magistrate, native of Xiàngshān 象山 (Níngbō 寧波 prefecture, modern Zhèjiāng 浙江). He served as Shíquán xiàn zhīxiàn 石泉縣知縣 (Magistrate of Shíquán, in modern Sìchuān).
His principal classical-canonical work is the Shī xù bǔ yì 詩序補義 (KR1c0064) in 24 juǎn — completed in Qiánlóng 19 jiǎxū (1754) per the catalog meta. The work systematically rehabilitates the xiǎo xù tradition against the fèi xù (abolish-the-xù) line of the ZhūLú (Zhū Xī’s Lú-school) tradition. Methodologically he extends the position of Sū Zhé 蘇轍 in his Shī zhuàn (KR1c0007) — taking the xù’s first sentence as guóshǐ (royal historian) -given (= gǔ xù / ancient preface) and the rest as jīngshī (commentary-master) -appended (= xù xù / continuation preface). Where Sū had simply excised the xù xù, Jiāng preserves it in his text but separates it from the gǔ xù by a one-character gap, allowing the reader to distinguish them.
CBDB id 136062 confirms 1709–1786. Standard reference works (Hé Yùmíng’s monographs; Bao Lǐlì) treat Jiāng as a representative late-Qiánlóng-period xiǎo xù-defender, and the Shī xù bǔ yì as the principal mid-Qing systematic xù-defense.