Janna J. Levin (born 1967) is an American theoretical cosmologist and a professor of physics and astronomy at Barnard College.

[1] Much of her work deals with looking for evidence to support the proposal that our universe might be finite in size due to its having a nontrivial topology.

She joined the faculty at Barnard College in January 2004 and is currently the Claire Tow Professor of Physics and Astronomy.

[6] Janna Levin is a professor of physics and astronomy at Barnard College of Columbia University with a grant from the Tow Foundation.

She researches black holes, the cosmology of extra dimensions, and gravitational waves in the shape of spacetime.