Dù Gāng 杜剛 is the Qīng dynasty author of the historical novel Nán Cháo Mìshǐ 南朝秘史 (KR4k0186). No biographical details — native place, examination record, official posts — have been found in standard Qīng bibliographical references. Multiple persons named 杜剛 appear in CBDB (ids 153046, 317106, 363799, 481839), but none carry date fields that permit identification with this novelist. The composition date of the novel is uncertain; a Qīng date in the eighteenth or nineteenth century is presumed on the basis of narrative conventions.