Jun-Muk Hwang (; born 27 October 1963) is a South Korean mathematician, specializing in algebraic geometry and complex differential geometry.
Hwang is the eldest son of gayageum musician Hwang Byungki and novelist Han Malsook.
Hwang studied physics at Seoul National University for his bachelors before studying physics at Harvard University. In 1993, he completed his PhD under the direction of Yum-Tong Siu with thesis Global nondeformability of the complex hyper quadric. In the following years he held positions at the University of Notre Dame, the Mathematical Sciences Research Institute, and Seoul National University. Since 1999, he was a professor at the Korea Institute for Advanced Study. He was in 2006 an invited speaker with talk Rigidity of rational homogeneous spaces at the International Congress of Mathematicians (ICM) in Madrid and in 2014 a plenary speaker with talk Mori geometry meets Cartan geometry: Varieties of minimal rational tangents at the ICM in Seoul.
In 2020, he was the founding director of the Center for Complex Geometry at the Institute for Basic Science. In 2023, he was selected to be on the committee for the Abel Prize.