Wang Yifang (; born February 1963) is a Chinese particle and accelerator physicist. He is director of the Institute of High Energy Physics (IHEP) of the Chinese Academy of Sciences in Beijing and known for contributions to neutrino physics, in particular his leading role (with Kam-Biu Luk) at Daya Bay Reactor Neutrino Experiment to determine the last unknown neutrino mixing angle .
After earning his bachelor's degree in physics at Nanjing University in 1984, he worked with Samuel CC Ting on the L3 experiment located at the Large Electron-Positron Collider (LEP) of CERN. Wang studied at the University of Florence, obtaining his PhD in Physics. He would then go on to work for the Laboratory for Nuclear Science located at the Massachusetts Institute of Technology, and later at Stanford University. He later joined the Institute of High Energy Physics (IHEP) in China as a researcher in 2001, eventually becoming the director in 2011.
Since 2014 Wang has been Director of the Jiangmen Underground Neutrino Observatory (JUNO) in Southern China leading the experiment in an effect to determine the neutrino mass hierarchy with neutrinos from nuclear reactors.