**Erica Gail Klarreich** (born 1972) is an American mathematician, journalist and science popularizer.

As a mathematician, Klarreich is known for her theorem in geometric topology that states that the boundary of the curve complex is homeomorphic to the space of ending laminations.

As a science writer, her work appears in publications such as *Nature*, *Scientific American*, *New Scientist*, and *Quanta Magazine*.

Klarreich's father was a professor of mathematics, and her mother was a mathematics teacher.

Klarreich obtained her Ph.D. in mathematics under the guidance of Yair Nathan Minsky at Stony Brook University in 1997.