Jiaxin Cheng (, born 2 October 1974) is a Chinese-born cellist.
Cheng graduated from the Shanghai Conservatory of Music, China, in 1997. She was already giving performances with the Shanghai Symphony Orchestra but left China for further studies in New Zealand where she received her Master's degree at the University of Auckland in 2001.
While in New Zealand, Cheng was principal cello of the Auckland Chamber Orchestra and played regularly with both the Auckland Philharmonia Orchestra and the New Zealand Symphony Orchestra. With the Auckland Symphony Orchestra she performed cello concertos by Dvořák, Elgar and Lalo. Cheng was also a founding member of the Aroha String Quartet.
Since 2007, Cheng has lived in London where she has given several recitals. Her performance in April 2008 at Her Majesty's Theatre with both Andrew and Julian Lloyd Webber was described as "the emotional highlight of the evening". She appeared as a soloist at the Royal Festival Hall in April 2011