Robert Llewellyn Sumwalt III (born June 30, 1956) is an American academic, aviator, government official and writer. He was a board member of the National Transportation Safety Board for over 15 years, from August 2006 to June 30, 2021, serving as the agency's chairman from 2017 to 2021. He currently serves as the executive director of Embry-Riddle's Center for Aviation and Aerospace Safety.