Thomas L. Delworth is an atmospheric and oceanic climate scientist and Senior Scientist at the Geophysical Fluid Dynamics Laboratory (GFDL), part of NOAA. He also serves on the faculty of Oceanic Science at Princeton University.

Delworth is a fellow of the American Geophysical Union and received its 2021 Bert Bolin Award for Climate research, for "major contributions in atmosphere ocean interactions through pioneering climate modeling that has advanced the understanding of climate variations, change, and extremes." He has been recognized as a Highly Cited Researcher by Clarivate Analytics for 2021 and multiple previous years for having "demonstrated significant influence through publication of multiple highly cited papers during the last decade".