Leon Emanuel Rosenberg (March 3, 1933 – July 22, 2022) was an American physician-scientist, geneticist, and educator. He served as chair of the department of human genetics and also as dean of the medical school of Yale University. He then worked as the chief scientific officer of the Bristol-Myers Squibb Pharmaceutical company. He wrote more than 300 research articles, chapters, and books on his scientific research and public policy views across his career.