Yáng Ěrzēng 楊爾增 was a late-Míng commercial publisher and fiction author active approximately in the Wànlì–Tiānqǐ period (c. 1600–1624), associated with the publishing house Xiōngyù táng 雄宇堂 in Sūzhōu 蘇州. He is known primarily as the compiler of the Liǎng Jìn Mìshǐ 兩晉秘史 (KR4k0056), a historical novel covering the Western and Eastern Jìn dynasties. He has also been associated with publications of vernacular fiction including a revised edition of Xīyóu Jì 西遊記. No biographical details such as courtesy name, examination record, or family background are recorded in standard sources. CBDB returns no entry for his name.