Chen Bang-yen (traditional Chinese: 陳邦彦; born October 3, 1943) is a Taiwanese-American mathematician who works mainly on differential geometry and related subjects.

[15] On October 20–21, 2018, at the 1143rd Meeting of the American Mathematical Society held at Ann Arbor, Michigan, one of the Special Sessions was dedicated to Chen Bang-yen's 75th birthday.

[18] The volume is edited by Joeri Van der Veken, Alfonso Carriazo, Ivko Dimitrić, Yun Myung Oh, Bogdan Suceavă, and Luc Vrancken.

Interestingly, the submanifolds for which the inequality is an equality can be characterized as certain products of minimal surfaces of low dimension with Euclidean spaces.

[24] In particularly, Chen and Nagano initiated the study of maximal antipodal set and 2-number (also known as Chen-Nagano invariant or Chen-Nagano number);[25][26][27] as an application Chen and Nagano were able to completely determine 2-rank of all compact simple Lie groups and thus they settled a problem in group theory raised by Armand Borel and Jean-Pierre Serre.

Also in Riemannian geometry, Bang-Yen Chen and Kentaro Yano initiated the study of spaces of quasi-constant curvature.

From the algebraic structure of the Gauss equation and the Simons formula, Bang-Yen Chen and Koichi Ogiue derived a number of information on submanifolds of complex space forms which are totally real and minimal.

By using the Codazzi equation and isothermal coordinates, they also obtained rigidity results on two-dimensional closed submanifolds of complex space forms which are totally real.