Sūn Zàifēng 孫在豐 (1644–1689), zì Qǐzhān 屺瞻, was an early-Kāngxī court official and editor from Déqīng 德清 (Húzhōu 湖州, Zhèjiāng 浙江). He passed the jìnshì examination in Kāngxī 9 = 1670 and rose through Hànlín appointments to Junior Vice-Minister of Works (Gōngbù shìláng 工部侍郎). He served on the imperial diary-lecture team and was in Kāngxī 19 (1680) commanded together with Niú Niǔ 牛鈕 (牛鈕) to compile the Rì jiǎng Yìjīng jiěyì 日講易經解義 (KR1a0116). His later career was tied to the supervision of waterworks (hé wù 河務) on the Yellow River, where in 1689 he died at his post in age 46.