Yongbin Ruan (Chinese: 阮勇斌; pinyin: Ruǎn Yǒngbīn; born 14 February 1963) is a Chinese mathematician, specializing in algebraic geometry, differential geometry, and symplectic geometry with applications to string theory.
Ruan studied from 1978 at Sichuan University with Benke Certificate of graduation followed by a master's degree in 1985.
In 1991 he received his Ph.D. from the University of California, Berkeley with thesis Gauge theory and its applications to Riemannian Geometry under the supervision of Robion Kirby (and Tomasz Mrowka).
He has been a visiting professor at the ETH Zurich, in Hong Kong, and at MIT.
In 1998 he was an Invited Speaker with talk Quantum Cohomology and its Applications at the International Congress of Mathematicians in Berlin.