Chéng Dàzhōng 程大中 (1721–?, zì Quánshí 拳時, hào Shìān 是菴), of Yīngchéng 應城 (Húběi). A mid-Qiánlóng-period private kǎojù scholar working in the early-Qīng Sìshū kǎozhèng tradition descended from Yán Ruòqú. His principal extant work is the Sìshū yìjiān 四書逸箋 (KR1h0066), in six juàn, dated 1757 in the catalog meta — submitted to the Sìkù programme during the Qiánlóng era. The Sìshū yìjiān is a kǎojù miscellany on points where the Zhū Xī Jízhù misquotes or fails to cite source-texts in the Sìshū; the Sìkù editors pair it explicitly with Yán Ruòqú’s Sìshū shìdì (KR1h0063) as a kǎojù-mode complement. CBDB id 89932 records his birth-year as 1721; his death-year is not given. Standard reference works name him only as a Húběi-region scholar of Sìshū kǎojù; biographical detail beyond this is not preserved in widely-available sources.