Quah Zheng Wen (Chinese: 柯正文; pinyin: Kē Zhèngwén; born 29 September 1996) is a Singaporean professional swimmer who specialises in individual medley, backstroke, butterfly and freestyle events.

[2] After completed his IB Diploma Programme, Quah was accepted into the Yong Loo Lin School of Medicine at the National University of Singapore, but chose to defer his studies.

At the 2012 Summer Olympics he finished 33rd overall in the heats in the Men's 400 metre individual medley and failed to reach the final.

At the 2015 Southeast Asian Games held in Singapore, Quah took part in 12 events, winning seven golds, four silvers and a bronze.

In the men's 4 × 100 m medley relay which consisted of Quah, Joseph Schooling, Clement Lim and Lionel Khoo, the team finished the race in 3:38.25, erasing the old record of 3:41.35 set in 2011.