Geoffrey C. Kabat is an American epidemiologist, cancer researcher, and author. He has been on the faculty of the Albert Einstein College of Medicine and State University of New York, Stony Brook. In 2003, he was co-author of a disputed BMJ study funded by the tobacco industry that found secondhand smoke did not affect mortality. Along with his scientific publications, Kabat has written four books and many articles for general audiences. As of 2019, he was a member of the board of directors of the Science Literacy Project and the board of scientific advisors of the American Council on Science and Health.