Helen S. Lang (February 19, 1947 – June 20, 2016) was an American philosophy professor and researcher, specializing in ancient Greek philosophy and science, medieval and Renaissance thought, and an expert on Aristotelian natural philosophy.^[1][2]

For over twenty years she was with Trinity College, Hartford (1978–2003^[3]), where she was the Koeppel Professor of Classical Studies^[2] (named in 2001^[3]). Her last affiliation was with Villanova University, Pennsylvania, where she was Chair of the Philosophy Department (2002–2005) and a department member at the time of her death.^[1][2]

As a scholar, Helen S. Lang was a fellow at the Dibner Institute for the History of Science and Technology at MIT and at the Institute for Advanced Study in Princeton, New Jersey.^[1]

Helen Lang wrote over three dozen articles and multiple book reviews.^[1]