Michael D. Lumpkin (born October 14, 1964) is a former American Naval Officer and businessman who served as the Special Envoy and Coordinator of the Global Engagement Center at the U.S. Department of State until January 2017. From 2013 until 2016, he was the Assistant Secretary of Defense for Special Operations and Low-Intensity Conflict. During that time, he also served as the acting Under Secretary of Defense for Policy, the third-highest civilian job at the United States Department of Defense.