Hee Oh (Korean: 오희, born 27 October 1969) is a Korean American mathematician and the Abraham Robinson Professor of Mathematics at Yale University. She made contributions to dynamical systems, discrete subgroups of Lie groups, and their connections to geometry and number theory.

She graduated with a bachelor's degree from Seoul National University in 1992 and obtained her Ph.D from Yale University in 1997 under the guidance of Gregory Margulis. She held several faculty positions, including ones at Princeton University, California Institute of Technology and Brown University, before joining the Department of Mathematics at Yale University in 2013 as the first female tenured professor in Mathematics there. She served as Vice President of the American Mathematical Society, February 1, 2021 – January 31, 2024.

She worked extensively on counting and equidistribution for Apollonian circle packings, Sierpinski carpets and Schottky dances.

Hee Oh was an invited speaker at the International Congress of Mathematicians in Hyderabad in 2010, and gave a joint invited address at the 2012 AMS-MAA Joint Mathematics Meeting. In 2012 she became an inaugural fellow of the American Mathematical Society. She is the 2015 recipient of the Ruth Lyttle Satter Prize in Mathematics. In 2017, she was named a Guggenheim fellow. In 2018, she received the Ho-Am Prize for Science. In 2024, she was inducted into the American Academy of Arts and Sciences.

She served on the Fields Medal committee at the 2018 ICM in Rio. She is on the Abel Prize committee for 2024-2026.